Yep:grin: i think so. When building my mixers, i added an extra output jack via a 1k resistor to the opamp’s output for that purpose. An extra output for an oscilloscope. The same could work for extra inputs as well. Since ive seen plenty of schematics with Arduino Nano’s (hagiwo) i see that outputs often are connected directly to jacks with clamping diodes. Output voltages often to low so using opamps will solve this. But hey who am i telling? m sure you already know.
still learning so excuse me if something i’m telling is not correct.