PULSAR MODULAR · A/D STABILIZING CLIPPER

P22Rail

Commercial loudness with a chosen character. Clipping, not limiting.

RAIL clips the program against a fixed rail at 0 dBFS, with a stabilizing engine ahead of the rail that prepares peaks before they are clipped. One control drives the program in, three flavors decide how the crossing sounds. This guide covers the controls, the panel, and the workflow.

INTERACTIVE PANEL

The interface at a glance

Hover any control to see what it does. Tap to pin a description. Use SHOW HINTS to reveal every control at once.

CHAIN TOPOLOGY

Where RAIL sits

RAIL sits at the end of the signal path. Three placements cover almost everything engineers do with it.

RAIL after Atlas

The recommended chain. Atlas stabilizes the program and leaves headroom; RAIL follows and drives that stabilized program into the clipper. DRIVE sets how deep the program goes, and reaches the clipper on its own. RAIL's PK IN confirms the level arriving at the clipper input. You can also watch the handoff from Atlas's TRIM PEAK instead.

RAIL standalone

A final clipping stage at the end of any chain, with no dependence on Atlas upstream. Place RAIL last. DRIVE does all the work of taking the program into the clipper, exactly as it does after Atlas. Choose a flavor, raise DRIVE to the depth the material rewards, and set the output with TRIM. Drive depth belongs to RAIL.

On stems and groups

A stem or group made louder and given character, then returned to its mix level so the session balance is unchanged. Stems often sit well below 0 dBFS, so a short gain-staging loop applies: stabilize and lift with Atlas near 0 dBFS, set RAIL's DRIVE for the flavor's sweet spot, then bring the stem back to its previous level with RAIL's TRIM. This is why TRIM only attenuates.

RAIL is a characterful clipper, not a true-peak safety device. It can leave inter-sample peaks above the ceiling. For delivery, keep a dedicated true-peak limiter after RAIL; if RAIL is the last stage, lower TRIM or DRIVE until TP MAX sits within the platform target.

FIRST FIVE MINUTES

A fast, trustworthy first pass

In one short pass on familiar material, you will hear what RAIL does and land a strong, loud setting you can trust.

Place RAIL last and bypass anything after it

So what you hear is RAIL alone. Start playback on a loud section of the material.

Leave DRIVE at 0 and listen

Watch the readout panel settle so you know where the program sits before you drive it. This is your reference.

Raise DRIVE until CLIP DEPTH reads 2 to 3 dB

Push DRIVE up slowly, watching CLIP DEPTH climb on the loud peaks. Two to three dB is the strong, musical working range. The inner ring around the dial fills as depth grows, so you can set it by sight as well as by ear.

Step through the flavors, then commit

Use the left and right arrow keys at this DRIVE setting. MODERN stays transparent, SHARP adds edge and presence, VINTAGE adds warmth. Leave it on the one that serves the music.

Press MATCH, toggle BYPASS, then set TRIM

MATCH takes a level-matched snapshot, so toggling BYPASS compares RAIL's character rather than louder against quieter. This is the moment RAIL reveals itself. If RAIL is your last stage, set the output with TRIM and check LUFS-I and TP MAX against your target.

TIP

Pick the flavor first, then drive. The flavor is the sound; DRIVE only decides how far into that sound the program goes. Auditioning DRIVE before settling on a flavor means tuning depth against a character you have not chosen yet.

FLAVOR → DRIVE → TRIM

Three controls, used in order

RAIL has three controls: FLAVOR, DRIVE, and TRIM, plus the MATCH and BYPASS utilities. The order to use them in is the order below: choose the character, drive into it, set the output.

PERFORMANCE

DRIVE

0 → 18 dB

The single performance control: how deep the program goes into the clipper. At 0, RAIL adds no drive of its own. As you raise it, more of the program crosses the rail, increasing loudness and the flavor's character together. Set DRIVE by watching CLIP DEPTH, aiming for 2 to 3 dB on the loud peaks; RAIL flags depths beyond 3 dB. Drag vertically; Shift-drag holds output level steady, Ctrl fine-tunes, double-click returns to 0. The same 0 to 18 dB range serves every flavor.

CHARACTER

FLAVOR

VINTAGE · MODERN · SHARP

The sonic character of the clipping, and the most important choice in RAIL: everything the listener identifies as RAIL's sound comes from the flavor, not from DRIVE. Select by clicking the circle or label below the dial, or with the arrow keys. Switching flavor keeps the drive you dialed in; if a flavor offers less range, RAIL holds at that flavor's maximum rather than rescaling. Audition flavors before tuning DRIVE.

OUTPUT & COMPARISON

TRIM

UNITY → −30 dB

The output level leaving RAIL, set without changing how hard the clipper works. TRIM attenuates only, from unity down to 30 dB, and applies after the clipper, so the character and depth you set with DRIVE stay exactly as they were. Reach for it to return a stem to its mix level, or to set a final delivery level. The small knob in the readout panel; double-click returns to unity, or click the TRIM value to type a level directly.

MATCH

A level-matched comparison, not a gain control. Pressing MATCH captures the loudness difference between RAIL's output and the dry input at that instant and applies a comparison attenuation to the louder path, so toggling BYPASS switches between two equal-loudness states and you judge character, not level. It never moves TRIM, and the readouts keep showing RAIL's true output, so your working and delivery numbers stay put. The button goes solid and stays solid until pressed again; read the DRIFT triangle row, not the button, to tell whether the held snapshot is still fresh, and press MATCH off and on to take a new one. It needs signal to measure, and because its attenuation is applied while engaged, disengage it before you bounce or render.

BYPASS

Takes RAIL out of the signal path so you can compare the program with and without it. Used together with MATCH, it gives a level-matched before-and-after, the fair way to judge what RAIL contributes rather than hearing louder as better.

READING THE PANEL

What every readout means

The panel shows what the clipper is doing at each stage, organized to follow the signal: what reaches and crosses the clipper, the output level, then the program leaving the plugin. The values are diagnostic, not decorative.

The DRIVE dial rings

Two rings give a live picture against the rail. The outer signal arc shows peak level approaching the rail, with the marked point being 0 dBFS. The inner clip ring stays dark until the signal crosses the rail, then lights to show how deep into the clipper the program is going.

Clipper group: PK IN, CLIP DEPTH, CLIP %

PK IN is the peak reaching the clipper input after DRIVE. CLIP DEPTH is how far peaks go past the rail, the number you set DRIVE by: 2 to 3 dB is the strong, musical range. CLIP % is the share of the program touching the clipper, small by nature, around one percent or below in normal use. Read CLIP DEPTH for intensity, CLIP % as a transparency gauge.

Output Level group: TRIM, TP, TP MAX

TRIM is the current attenuation, from 0.0 dB at unity down to minus 30 dB. TP is the current true-peak at the output. TP MAX is the highest true-peak recorded since the last reset. RAIL reports true-peak but does not guarantee it; for delivery, place a dedicated true-peak limiter after RAIL.

Program group: LUFS-I, MATCH △, LRA

LUFS-I is integrated loudness of the output since the last reset, the headline number for matching a delivery target. LRA is loudness range of the output; lower values mean more compressed dynamics. On immersive buses the panel adds LFE PEAK and CLIP BAL. The MATCH △ / DRIFT △ row is state-aware: with MATCH off it reads MATCH △, the current loudness gap between the output and the dry input; with MATCH on it becomes DRIFT △, reading 0.0 at the press and growing as the held snapshot drifts.

Comparison row: MATCH △ / DRIFT △

A single state-aware row tied to the MATCH button, sitting between LUFS-I and LRA. With MATCH off it reads MATCH triangle, the current loudness difference between the output and the dry input, a preview of what MATCH would compensate. With MATCH on it relabels to DRIFT triangle, reads 0.0 the moment you pressed MATCH, and grows as the held snapshot drifts from the moving program. Read this row, not the solid button, to judge whether the match is still fresh.

The alarm dot

A single dot lights when any readout passes a conservative point, and the row that tripped renders brighter. It watches three: clip depth beyond the everyday range, true peak above 0 dBFS, and loudness hotter than typical targets. It is guidance, not a fault, deliberate clipping can light it. Treat it as a prompt to confirm intent, and to check the downstream chain when the true-peak row trips.

Reset and transport

One global reset clears every accumulating value at once: LUFS-I, LRA, TP MAX, and the held peaks. RAIL uses one reset rather than per-row resets. Pressing play in the DAW also clears the readouts and starts a fresh measurement; pressing stop freezes them at their last values. Reset does not disengage MATCH: if MATCH is engaged when you reset, it stays engaged and keeps its snapshot.

THE THREE FLAVORS

Choosing a flavor is choosing a sound

Each flavor behaves like a different converter being clipped, with its own character and its own useful drive range. Choose by intent, confirm by ear.

MODERN

Transparent · clips soonest

Loudness with as little audible character as possible. Its identity is consistency: it engages the same way peak after peak, and that uniformity is what the ear reads as transparency. It tolerates the least drive before clipping becomes audible. Use it on material that is already well balanced and simply needs to be brought up, where any added color would be a liability.

SHARP

Defined, present · moderate

Loudness with a defined edge, presence, and transient focus. Its character is a quicker, more decisive bend into the clipper than MODERN. As you drive it, its edge moves from a light seasoning to a clear, intentional effect, and it tolerates a moderate amount before that effect takes over. Use it on rhythmic and produced material that benefits from added definition.

VINTAGE

Warm, wide · holds longest

Loudness with warmth, body, and a wider perceived character. VINTAGE is asymmetric, which is the source of its warmth and harmonic richness. It shapes the program over a wider zone before the rail and tolerates the most drive of the three, because more drive deepens the warmth without losing the identity, until eventually the warmth would turn thick. Use it where the goal is not transparency but a louder program that also sounds bigger.

CHOOSE

The fastest way to choose is to audition: set a modest DRIVE, step through the three flavors with the arrow keys at matched level using MATCH, and listen for which character serves the music. Then tune DRIVE for that flavor.

WORKFLOW

Working with RAIL

Organized around the results engineers usually want. Tune RAIL with anything after it bypassed, so every judgment is about RAIL alone.

Commercial loudness with a chosen character

Choose the flavor that fits the material. Raise DRIVE while listening, watching CLIP DEPTH climb toward 2 to 3 dB on the loud peaks, until loudness and character are where you want them. Set the output with TRIM if a specific delivery level is required, then confirm LUFS-I and TP MAX against the target.

A fair before-and-after

Set the flavor and DRIVE you are considering. Press MATCH to capture a level-matched snapshot at the current settings. Toggle BYPASS and listen: with levels matched, the difference you hear is the clipper's character, not its loudness. MATCH holds the snapshot from the moment you press it, so watch the DRIFT triangle row as the program plays, and press MATCH off and on to refresh it after you change DRIVE. Because MATCH applies its attenuation while engaged, disengage it before you bounce.

Loud character on a stem or group

Stabilize and enhance with Atlas, raise Atlas's TRIM to bring the signal near 0 dBFS so it enters RAIL's working range, set RAIL's DRIVE to the sweet spot for the flavor, then attenuate with RAIL's TRIM until the stem sits where it did in the mix. Because TRIM only attenuates, the level you added with DRIVE is given back cleanly at the output.

Driving RAIL from Atlas

When you want to set the feed from the Atlas side, leave RAIL's DRIVE modest and raise Atlas's TRIM, reading Atlas's TRIM PEAK to see exactly how much level is passing into RAIL. Useful when balancing how much work Atlas does against how much RAIL does. Driving entirely with RAIL's DRIVE and reading PK IN reaches the same result; choose the panel you prefer to watch.

IMMERSIVE OPERATION

One program across the soundfield

This applies only to RAIL Immersive. It treats every main channel of a multichannel bus as one program and clips them consistently, so the spatial image is preserved as the program is driven into the rail.

Supported layouts

Mono, stereo, LCR, quad, 5.0, 5.1, 7.0, 7.1, 7.1.2, 7.1.4, and 9.1.6. The DAW determines which are available based on the bus, and RAIL adapts its readout panel to match. Mono and stereo behave as in RAIL Stereo; the surround and immersive formats are unique to RAIL Immersive.

Channel layout indicator

The current layout is shown next to the P22 RAIL name at the top, for example STEREO, 5.1, or 7.1.4. This confirms at a glance which format RAIL has detected and which readouts are active.

LFE PEAK and CLIP BAL

LFE PEAK appears on any layout with an LFE channel, showing its peak with a reference cue at minus 3 dBFS. RAIL passes the LFE through untouched and keeps it time-aligned, so the value is a level check, not RAIL's work. CLIP BAL appears on surround and immersive layouts, showing how clipping is distributed across the front, surround, and height groups (F, S, H). Use it to confirm clipping lands where you expect.

The LFE channel

RAIL monitors the LFE but never clips it. The low-frequency channel is passed through unchanged and kept time-aligned with the clipped main channels, so bass management is left to the mix and the platform's requirements. Band-limiting and content rules for the LFE remain an upstream concern.

Working tips

Immersive masters are delivered well below 0 dBFS, often around minus 18 LUFS-I, so use the stem loop: lift near 0 dBFS upstream, set DRIVE for 2 to 3 dB of CLIP DEPTH, then bring the program back with TRIM. Land the return by reading LUFS-I and TP MAX against the platform target rather than by ear. Commit on the reference reproduction system, confirm on binaural, and watch CLIP BAL.

PRESET MANAGER

The preset browser

Although RAIL's sound lives in the flavor and DRIVE, presets save and recall complete settings, including TRIM, for recurring material and delivery targets. Click the preset name at the top of the plugin to open the browser. Hover any element below to see what it does.

FOLDERS

★ Favorites

▸ Folder A

▸ My Masters

PRESETS

★Preset 01

☆Preset 02

★Preset 03

☆Preset 04

Hover any element above to learn what it does.

SHORTCUTS

Interface conventions

A few interactions are consistent across the whole interface.

Action	Result
Double-click a control	Returns it to default: DRIVE to 0, TRIM to unity
Shift-drag DRIVE	Holds output level steady (TRIM moves the opposite way)
Ctrl-drag a dial	Fine adjustment, reduced sensitivity
Click the TRIM value	Type a level directly, to match a reference
Left / right arrow keys	Step through the flavors
Up / down arrow keys	Change DRIVE by 1 dB (Shift for 0.1 dB)
Click the preset name	Opens the preset browser; arrows step through presets
DAW play / stop	Play resets and starts fresh; stop freezes the readouts

MANAGING PRESETS

Saving and backing up

The browser

Two panes: folders on the left, including a Favorites folder, and the presets inside the selected folder on the right, each with a star to toggle its favorite status. Controls along the bottom let you create a New Folder, Save into the selected preset, Save As a new preset, Rename, Delete a user preset, and Close.

Step without opening

Use the previous and next arrows beside the preset name to step through saved presets without opening the browser, auditioning them in place.

Backing up

Presets are files on the local machine and can be backed up by copying them to any location:

Windows

C:\Users\Public\Documents\Pulsar Modular\P22 Rail\Presets

macOS

/Users/Shared/Pulsar Modular/P22 Rail/Presets

UNINSTALLING

Removing P22 Rail

Delete the plugin files for each format, plus the shared files folder.

Windows

VST3

C:\Program Files\Common Files\VST3\Pulsar Modular\P22 Rail.vst3

AAX

C:\Program Files\Common Files\Avid\Audio\Plug-Ins\Pulsar Modular\P22 Rail.aaxplugin

Shared files

C:\Users\Public\Documents\Pulsar Modular\P22 Rail

macOS

/Library/Audio/Plug-Ins/Components/P22 Rail.component

VST3

/Library/Audio/Plug-Ins/VST3/Pulsar Modular/P22 Rail.vst3

AAX

/Library/Application Support/Avid/Audio/Plug-Ins/Pulsar Modular/P22 Rail.aaxplugin

Shared files

/Users/Shared/Pulsar Modular/P22 Rail