GR-1 Firmware 2.5.1

Bug fixes:

- Kill performance function caused issues and an alert after saving. 
- Cleared samples caused missing or biased flat line on display.
- Knob setpoint for panning was missing. 

Known issues:

- Clicks in distortion FX (similar to snare instrument pick up noise) when multiple voices triggering/releasing..
- No visual feedback on a bunch of CC's.
- Freeze on first USB plug after firmware update (a very old one).