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First, a quick explanation of the high-tech way Lessard gets that sound, pretty much any sound he wants, while live on stage.

"We play so many different styles of music, and there are so many different elements inside the songs that change. One minute it might be kind of jazzy and the next it's all out rock. I kind of need a real versatile system," Lessard said.

A few years ago, he would have needed a row of effects pedals and different types of amps to get each particular sound. However, today his bass is routed through a Mac mini-computer that runs software called AmpliTube XGear.

Developers at IK Multimedia said it serves up just about any guitar or bass effect ever conceived, played virtually through just about any style of amp or cabinet. When combined, the software features more than 20,000 different sounds.

Lessard's bass and violin tech Erik Porter said only once in two years has there ever been a system crash.

"We have a UPS backup battery to keep the computers running in case the power does go down. We have we have two computers running at all times so if a computer were to go down, we switch to a backup computer and it's all pretty easy to make that switch it'd take about 30 seconds," Porter said.

Now here is where it gets exciting for anyone who's ever stepped anywhere near a guitar or bass. Much of what Stefan is doing on stage, you can also do by plugging your guitar or bass into your iPhone.

"I was surprised the first time I plugged it in. I didn't know what to expect out of it, and it sounded just like my stage sound," Lessard said.

Lessard is not a paid endorser. The app itself costs anywhere from $0 to $20 depending on how many features and effects you want. The adaptor itself is another $40.