External sound boxes for a guitar and synth piano??

[DMars79]

All right I recently got novation launchpad and I have been playing with it for a good number of hours now but I wanted to know if you all had any ideas on external sound boxes I could buy to be able to synch a synth piano and guitar with effects pedal to play instrumentals then loop them on the launch pad ?

A cheap external sound box Would be nice but note that I have one free USB on my MacBook so I guess the sound box would have to have 2-3 seperate plug ins so I can plug a guitar and synth in.

Ideas would lovely

[DMars79]

And to add a slot for speakers and would I need to connect my amp? I need a pros answer please

[kanuck]

theoretically as long as you have enough ins and outs it should completely work. I've personally never tried this before but this is why ableton made an audio effect called "external effect" or something like that. Read the manual for more details.