Hi Bernie.

The amp is designed specifically to deal with stereo sound . This app can handle any stereo sound whether that is vocals guitars you name it. I have a couple of mono piano samples on my korg and have played these through the amp . In my experiments only the front facing speaker is activated. In other words it becomes a conventional single keyboard speaker. But by adding a smidgen of reverb the amp is somehow able to detect left and right signals and converts the mono sample into a stereo sounding sample. In other words both the front facing and side facing speakers are activated.also just as a general tip the amp is sensitive to reverb and therefore you need less reverb generally in all your mixes then you would do if you were using a conventional keyboard amp.