GR-MEGA firmware 1.5.3 release notes

A bugfix release, with minor feature additions.

Date: 02 January 2026

new features:

- Attack and release for input envelope follower. [Shift] + [ADSR Curve] to activate. Then use A and R sliders.
- More feel/help bubbles.
- Polyscan visualization.
- Experimental record feedback: mix resampling and audio input. Use [Shift] + Env amount fader while recording.

changes:

- Ability to record with the slice sound engine directly. The GR-MEGA switches to granular for the duration of the recording session to allow scrolling record, and resampling with full position control. Afterwards it switches back to slice engine.
- #1259 Individual Patch loads (GR-MEGA and GR-1) are no longer seen as permanent. Pressing the undo button or pressing the preset button will undo the load and return to the original patch.

bugfixes:

- #1689 Copy paste causes modifications to destination preset will also be present in source preset! Introduced in 1.5.0. This effectively crippled copypaste. 
- #1194 unimplemented midi cc's finally implemented: glide, glide always, window type, arp mode, scan mode, sampling dry, sampling wet.
- Grain stealing fixed for grain rates around 100 Hz.
- #1683 playing notes in Scan key trigger = Poly and then Scan key trigger = Off caused drifting scan positions.
- Fixed [Shift] + [Enter] in menu screens. This closed off the access to the factory reset function! Bug introduced in 1.5.2.
- Loading project refreshed preset LEDs, but not the internal state. The next press on [Play] resulted in preset 1 LED turning on. 
- Removing "phantom" usb drives was broken.
- Avoid potential log clogging in release version.

known issues:

- high cpu load when connected to Macs via USB C, and using USB audio + MIDI + file sharing