DEEP/4 Release Notes

• Performance improvements

• Added Pitch Shift 2U algorithm — a two-unit splice-based pitch shifter with zero-crossing detection, two independent voices with semitone/fine tuning, pan, and LFO modulation

• Added Vocoder 4U algorithm — a four-unit vocoder with independent per-band controls for speech gain, sibilance, response time, and pre-emphasis. Uses left input as modulator and right input as carrier.

• Multi-unit algorithms now use a unified ganging system. Companion units lock their algorithm selector but retain independent parameter controls where appropriate (e.g., each vocoder band has its own settings). State is saved and restored when switching between ganged and non-ganged algorithms.

• Presets now load relative to the selected unit tab. 1U presets apply to whichever unit is selected. 2U presets apply to the pair (A/B or C/D) containing the selected unit. 4U presets apply to all units as before.

• Improved DAW session state synchronization — plugin settings, LFO configurations, MIDI CC mappings, and selected unit are now reliably preserved when closing and reopening the plugin window or reloading a DAW session

• Click the LED indicator on any unit tab to bypass that unit without switching tabs

• Updated help documentation to better reflect the plugin experience

• Fixed tempo sync not following DAW tempo changes

• Fixed tempo sync settings not being remembered when closing and reopening the plugin

• Fixed Tempo Delay "Tap" and "MIDI" modes not being restored after close/reopen

• Fixed license validation for names with non-ASCII characters (accents, umlauts, etc.)

• Improved LFO performance

• Save LFOs for Logic's native preset format (AU presets)

Preset System

• "Save As" now pre-populates with the current preset name for quick iterative saving

• Saving a preset with the same name in the same bank now overwrites it instead of creating a duplicate

• Added Cancel button to the preset save row

• Preset list is now disabled while in save mode to prevent accidental loads

LFO

• Backward (BWD) direction now also inverts polarity for a more musically intuitive opposite of the forward direction

• Ping-pong (PNG) direction now inverts polarity on the backward pass, creating a true mirror of each cycle

• LFO modulation dot on knobs is now always visible instead of only on hover

• Disabled LFO assignments no longer show an animated dot

LFO System

• Right-click any knob to assign an LFO directly from a color-coded submenu — no drag required

• Assigning an LFO now automatically switches the LCD to show that LFO's editor

• LFO trigger mode: added per-LFO threshold knob (THRS) to control transient detection sensitivity

• Double-click any LFO knob (rate, threshold) to reset it to its default value

• Draw mode buttons (Curve, Line, Saw) are now three separate icon buttons with orange highlight on the active mode

• Added reverse button to horizontally flip the LFO waveform shape

• Direction (FWD/BWD/PNG) and Trigger (FREE/TRIG) controls moved to their own column for better organization

DSP / Audio Quality

• GPR writes are now synchronized to the DSP cycle boundary, eliminating clicks and pops when changing parameters — matches the ES5510 hardware's host transfer timing

Bug Fixes

• Fixed LFO drag badge drifting from cursor at 125% and 150% UI scaling

• Fixed internal LFO L/R mode labels: "Mono"/"Stereo" corrected to "Out of Phase"/"In-Phase" across all algorithms

• Tempo Delay: restored Tempo Control selector (Internal / MIDI / Tap)

• Tempo Delay: added Tap Tempo button for setting BPM by tapping

• Tempo Delay: MIDI mode now syncs to host DAW tempo

• Tempo Delay: removed SYNC button in favor of Tempo Control selector

• Fixed knob labels getting cut off on long parameter names

• Fixed initial sound out of right channel on startup bug

• LFO curve editor: dragging a segment between two control points at the same height now visibly bows the curve up or down, instead of having no effect

• LFO curve editor: tension dragging now always adds a visible bulge to any segment, including nearly-flat ones that previously produced extreme cinching

• Fixed MIDI Assignments dialog "Learn" button text bleeding through the flashing "Next" indicator

• Fixed preset reset button not working when a user preset is selected

DAW Integration

• All DSP parameters are now visible to DAWs and control surfaces — previously hidden parameters can now be mapped via DAW automation, MIDI learn, and hardware control surfaces

• Parameters use a normalized 0–1000 range so control surfaces get full knob travel regardless of the algorithm's native parameter range

• Hover over any parameter label in the unit panel to see its DAW parameter name (e.g. "A: Param 01") for easy mapping

LFO System

• Four independent LFOs with drawable curve editor — create custom modulation shapes by adding, moving, and removing control points with adjustable tension

• Three drawing modes: Curve (freeform), Line (step sequencer), and Saw (sawtooth) — each snaps to an adjustable grid

• Drag-and-drop LFO assignment to any knob parameter — drag from an LFO tab button onto any knob to assign modulation

• Bipolar modulation with adjustable depth — LFO sweeps symmetrically around the knob's base value

• LFO rate supports both free-running Hz mode and BPM-synced note divisions with straight, dotted, and triplet modifiers

• Forward, backward, and ping-pong direction modes with free-running and transient-triggered playback

• LFOs can modulate MIDI tempo-synced parameters — sweeps through valid note division values

• Per-LFO color coding (orange, blue, purple, pink) — assigned LFO tabs, depth rings, and drag indicators all show the LFO's unique color

• Copy and paste LFO configurations between slots

• Adjustable grid resolution for the curve editor

• Right-click context menus on the LFO graph for adding/removing points

• LFO state saves and restores with presets

MIDI Learn

• MIDI CC learn for all knobs and switches — right-click any control and select MIDI Learn, then turn a physical knob to assign it

• Same CC can control multiple parameters simultaneously

• MIDI Learn and LFO modulation coexist — MIDI CC adjusts the base value while the LFO continues modulating around it

• Batch MIDI Learn — click Learn on one parameter, shift-click on another in the same section to select a range, then turn physical knobs sequentially to assign them all

• MIDI Assignments dialog — view, learn, and remove all MIDI CC mappings from a centralized panel accessible from the toolbar or any knob's context menu

• Per-section reset in the MIDI Assignments dialog with confirmation

• CC number badge displays on assigned knobs for quick visual reference

• MIDI mappings save and restore with presets

• Global parameters (Master Volume, Global Mix, Input Trim, Pair Amounts) are also MIDI learnable

UI Improvements

• Right-click context menus on knobs for LFO removal, MIDI Learn, and accessing MIDI Assignments

• Right-click context menu on LFO tab buttons for Initialize and Remove All Assignments

• Updated documentation with all new features

• Redesigned parameter layouts across all algorithms for a more intuitive and consistent control arrangement — all sliders replaced with knobs

• Ctrl+click (Cmd+click on Mac) any knob to jump directly to its maximum value

• Decay parameters now display actual time values in seconds (e.g. "2.89 sec") instead of arbitrary 0–99 numbers. Each reverb algorithm shows its own accurate decay range (Hall: 0.70–250s, Large Plate: 0.40–140s, Large Room: 0.20–150s, Small Room/Plate: 0.20–100s).

• Compressor and expander ratios now display as "1.5:1", "Inf", etc. Attack, release, and gate times show real time values like "50us" or "3.5s". Filter cutoff frequencies display in Hz.

• Reflection time parameters now display with a "ms" suffix on all reverb algorithms

• Mix, Volume, and Input controls now display 0–99 matching the original hardware, instead of the raw 0–127 internal range

• Mix and Volume now default to 99 (full) when selecting a new algorithm, matching hardware behavior. Previously these used per-algorithm preset values that could start partially turned down.

• Fixed display scaling for parameters with non-zero minimum values (e.g. HF Bandwidth starting at 2) which were incorrectly showing the raw 0–127 range instead of 0–99

• Fixed plugin GUI displaying scrollbars on Windows when system text scaling is set above 100%

• Updated look and feel — new blue-steel color scheme for the unit panel, tabs, toolbar, and dropdowns. Flat dark background with complementary tinted accents throughout. Sliders and switches now use neutral gray fills. Signal flow diagram recolored from red to green. LED indicators are now rectangular. Logo and subtitle use matching typography.

• Signal flow diagram now shows peak level metering — waveform bars change color from green to yellow to red as signal approaches clipping, giving real-time visual feedback on signal health

• Performance improvements

• Reverb predelay parameters are now MIDI tempo syncable (Hall, Large Room, Small Room, Large Plate, Small Plate)

• Gated Reverb attack, hold time, and release time are now MIDI tempo syncable

• MIDI sync minimum note division is now 1/64 (previously 1/32)

• Fixed slider controls stretching beyond their intended width on some operating systems

• Updated unit panel look and feel — active tab is now light with a plastic sheen and specular highlight, inactive tabs are dark, giving clearer visual feedback for the selected unit

• Fixed MIDI sync — enabling tempo sync now immediately snaps all syncable parameters to their nearest note division value instead of waiting for manual interaction. Changing the sync modifier (straight/dotted/triplet) also re-snaps values immediately.

• Fixed preset browser arrows to cycle through user bank presets in addition to factory presets

• Slapback parameters on Gated Reverb and Reverse Reverb now display in milliseconds and are MIDI tempo syncable

• Per-unit MIDI tempo sync — lock delay times and LFO rates to your DAW's tempo on a per-unit basis.

• Draggable unit tabs — reorder effect units A/B/C/D by dragging tabs to customize your signal processing order

• Preset bank management — create, rename, and delete custom banks to organize your presets

• Import and export banks to share between sessions and back up your work, using SysEx format compatible with the original hardware

• Added mono track support — plugin now works on mono channels in all DAWs

• Eliminated scroll bar on algorithm panel by carefully sizing controls to fit within the available space

• Plugin now displays in the Effect category in Pro Tools

• Removed the "Killed" bypass state — bypass is now a simple two-state toggle (Active/Bypassed) for a cleaner, more predictable workflow

• Added keyboard shortcut hints below the unit panel for quick reference (Alt/Option+click for fine adjust, Shift+drag for snapped increments)

• Double-click a knob's value to type in an exact number — press Enter to commit or Escape to cancel

• Improved knob notch visibility with brighter, longer indicator marks

• Fixed preset change artifacts — delay RAM is now cleared when loading a new algorithm, eliminating the flanging and transients caused by stale delay data from the previous preset. Combined with an improved crossfade (30ms mute + 20ms cosine fade-in), preset and algorithm changes are now clean and seamless

• Knobs now display hardware-accurate 0–99 values (and –99…99 for signed parameters) matching the original DP/4 front panel, instead of the raw 0–127 internal range.

• Corrected parameter ranges in eight algorithms:

– Hall Reverb: Ref1 Send max corrected from 255 to 127

– Small Plate: Predelay max corrected from 500 ms to 430 ms

– Non-Linear Reverb II: Ref1 and Ref2 Time max corrected from 85 ms to 600 ms

– Expander: LowPass Fc max corrected from 29 to 39

– Keyed Expander: LowPass Fc max corrected from 29 to 28

– Phaser/DDL: LFO Rate internal range corrected from 0–99 to 0–127

– EQ/Vibrato/DDL: Vibrato Rate internal range corrected from 0–99 to 0–127

• Delay time parameters now display with a "ms" suffix (e.g. "375 ms" instead of "375").

• Fixed bug where user presets would not persist in certain cases

• Fixed UI flickering when switching presets

• Smooth crossfade between presets and algorithms to eliminate audible clicks on changes

• Added 125% UI scaling option for a middle ground between 100% and 150%

• Added value labels next to Input, Mix, and Volume knobs to make them easier to recall

• Fixed pops and clicks that occurred with Pitch Shifter in serial and feedback routing modes

• macOS compatibility extended back to Monterey (12.0)

• Hold Alt while dragging knobs or sliders for fine-grained precision control

• Hold Shift while dragging for coarse stepping through larger value ranges

• Initial release