Attack channel has a few bugs

[retrodpc]

• Grace notes on attack channel are treated like regular notes
• Using dynamics on attack channel will cause it to break rehearsal points

This file clearly demonstrates both bugs; please run it through the Pently compiler

[pinobatch]

In your example:

time 4/4
scale 16
tempo 150

This sets 6 frames per row.

e'8 f+' g' c#''8g d'' w2

The grace note duration is 8 frames, which exceeds one row. From pentlyas.md:

Be aware that grace notes longer than one row have poorly specified effects

However, a more well-formed pattern still displays a problem:

e'8 f+' g' c#''16 w2g d'' w2