On the measure where you want to mute an instrument(s) press F5 - See pic 1-F5
On the measure where you want to unmute an instrument(s) press F5 - See pic 2F5

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1-F5.jpg (93.62 KB, 56 downloads)
2 F5.jpg (98.54 KB, 56 downloads)

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64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware