A salesperson at a music store just told me that I could use an Art MyMonitor and be able to plug my bass, output from a CD player, and my headphones into the thing and be able to hear myself play along to a CD. This, of course, does not even remotely work this way. You can't just y-adapter your CD player into it, plug your instrument cable into it, and hear EITHER ONE from the headphones, much less both. Is more jury-rigging necessary? Is this what this device was even meant to do? What kind of device(s) WOULD serve this purpose? Now, I know of expensive gear that lets you play along to CD's where nobody else can hear you. But I need a CHEAP way to do this.