GR-MEGA firmware 1.4.6 release notes

A hotfix release.

Date: 30 September 2025

bugfixes:

- shutdown dialog would not reopen after closing it with [Menu], [Load], or [Save] buttons.

known issues:

- 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