Applies to Peak and Summit
Some of the modulation sources of the Peak and Summit synthesisers are retained across patches, per voice.
For example, the keyboard source will be remembered across patches. Note that this behaviour is per voice, so if you have played a note below or above C3 (the centre point for the keyboard mod source) you would need to play C3 for each voice to set the keyboard mod source back to zero across all patches.
This behaviour can explain why notes may appear to be held across patches, assigning the keyboard mod source to VCAlevel and then playing a note above or below C3 will cause a note to drone, moving to a patch where this modulation behaviour has not been assigned will stop the note, but without playing C3 enough times to clear the keyboard modulation source data for all voices will result in the note drone to reappear when going back to the original patch.
Other consistent mod controls include velocity, mod wheel and Direct (with depth set to a value)