The TTS 1 has a flaw with the default kick. It's stuck at a velocity of 127 which is why it's so loud. Years ago Biab added a popup when you first use it that says "Change default kick drum from part 34 to 35? (not sure about the exact number). Whatever it is just say yes. The TTS 1 is over 20 years old and Roland has never fixed that. That's what you get with a freebie.

As for the question in general regarding midi instrument or individual drum kit parts volume levels, they can either be controlled with the plugin or the Biab piano roll.

Bob


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