GR-MEGA firmware 1.4.0 release notes

Mainly improvements in modulation, most noteworthy modulation of the Phase Vocoder sound engine.

Date: 17 July 2025

new features:

- #1352 crop to current zoom level. *Zoom in* -> (Op Enc) -> "CROP ZOOMED"
- #1356 fft sizes 256 and 512 in phase vocoder
- #1071 spectral modulation 
- #1046 random modulation sources (RANDOM1,2,3,4) that can work per-voice or per layer
-  #897 modulation of synced knobs.. the generative musician will probably appreciate this one.
-  #905 modulation of lfo quantization
-  #898 Hold AUX button and turn knob to assign it to the AUX envelope.
- "categories" column in matrix screen - since the destination list is quite huge, this helps to quickly jump to the part you need.
- #1382 savedialog - warning and type lock when working in an external project. you are now forced to save the external project to an internal slot, before you can save anything else.
- #1321/#1400 System menu Toggle: MIDI play => Sequencer play. because some users want to use their external sequencer / external clocking and keep the internal sequencer OFF. 
- #1350 file manager - usb eject : press [Shift] + [Enter] on a drive, and then press "⏏" to eject it
- #1359 file chooser/file manager : press [Shift] + [←] to go back to parent folder
- #1420 save dialog now opens with current project slot, and asks for confirmation when a project is to be saved
-  #931 clock synced knobs now stay in phase after having had their rates changed. this is good for rhythmic effects. 
- #1345 play follows rec - midi notes now also follow rec head. 
- #1407 sustain slider remains available when ADSR Curve mode is active
-  #651 system menu - global - metronome volume
- spectrogram - vertical cutoff visualization now in all sound engines.
- #1361 remote login

changes:

- reorganized system menu into 4 submenus [Global, UI, MIDI, IO] instead forcing the user to scroll through one big list 
- #1389 graphical filter cutoffs (=darkened areas) now only visible in spectrogram view
- reversed knob direction for synced rates in lfo, and delay time (completely left = minimum speed, completely right = maximum speed)
- #1324 filters - slight boost to minimum resonance. 0% now means it doesn't sing, but also doesn't lose power.
- #1090 improved calibration of CV inputs.
- matrix screen - mod source "NONE" variant now first in the list

bugfixes:

- #1376 ADSR faders sent Amp envelope CC's even when Pitch, Filter, and Aux filters are selected. could lead to annoying situations with MIDI learn, or with cc feedback.
- #1397 multitimbral + midi preset switch on another layer would always send program change on channel 1. this now properly listens to the layer midi channel setting (in system menu). 
- #1428 REC to WAV didn't respond to pressing [REC] button twice in order to stop it. 
- #1432 crash after having used init preset ([Shift] + [Delete] in main screen) and then turning (Spray) in PhaseVoc mode. 
- #1433 crash when switching between sampler mode presets and a grain is near the end of the sample.
(- #1334 update procedure - usb/lan choice dialog was hidden after second or third try.)
- #1390 shift-deleting sequencer column 1 would delete entire bar. incorrect shift update for bottom 5 rows (change & seq mod)
- #1387 lfo side panel - default destination seemed like LPF cutoff, but the (lfo destination) encoder defaults to a different destination in the list.
- fixed gr-1 patch import crashes 
- #1380 scan key trigger OFF - switching presets didn't initialize center position
- stop audition by pressing play (just once ;-)).
- #1391 with external clock on, midi beat clock play and then stop starts and stops the sequencer.. preset buttons 5..8 were then permanently(?) assigned to sequencer steps
- #1394 preset switch zoom out
- l/r channels were reversed in sample display
- #1435 grain plops at boundary in Sampler mode
- pitch string format corrected
- #1245 correct name displayed at the bottom of the screen after having imported a project with the load file chooser. 

known issues:

- pot pickups not implemented for a lot of controls
- various MIDI CC's to still be implemented: glide, arp mode, scan mode, recording/sampling levels, window settings 
- high cpu load when connected to Macs via USB C, and using USB audio + MIDI + file sharing