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free-audio / interop-tracker

A place to track bugs between host and plugins
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Bitwig Studio 4.4.4 sends incorrect values for gain expressions #49

Closed robbert-vdh closed 1 month ago

robbert-vdh commented 1 year ago

The values Bitwig sends to the plugin for gain expressions are incorrect. Setting a note's gain expression to -12 dB causes Bitwig to emit a volume note expression with value 0.63095737, aka -4 dB. a +12 dB expression gets you 1.5848932, aka +4 dB. The decibel values are always off by a factor 3 as setting -3 dB in Bitwig gets you the equivalent of -1 dB in the note expression and +3 dB in Bitwig gets you +1 in CLAP.

The gain expression values are also off for VST3, but in a completely different way. There -12 dB, 0 dB, and +12 dB result in the plugin receiving note expressions for +2 dB, +6 dB, and +10 dB.

abique commented 1 year ago

Hi @robbert-vdh Thank you very much for reporting this issue, it is now fixed for bitwig 5.0 beta 7.