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I have work on a code to play different instruments. I do not have external sound card so it's just one from Mbp. As I've experimented I cann't have multiple output (please tell me if this is incorrect). The .setGain() work fine at different time when the instruments play. **But what if I have their volumn to be different but at the same time. For example, if I want the note to play loader than the bass at the 2.00 second. **
I am not able to do that with one output I suppose because the setGain has been determined for one output at a time. So I wonder, if there is way to work around this beside buying an external usb sound cards. (There is a limitation of the physical fabrication and concept.)