Originally Posted By: PianoPete
In my case, my external synth is receiving (utility guitar) MIDI on Channel 1, so I will hear both RT Guitar and synth MIDI audio when BIAB is playing.

Is there any setting to disable this?



Check your preferences. There have been reports that these have changed from the defaults.

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6