On a strictly "convenience" level, an emphatic yes.
I've been using a DSO (plenty on EBay for <$100 USD. I've got the MicroSD DSO201) for a couple of years now. Only good to 1MHz input, but for audio work it's the aces. Don't pitch the textonix, but by all means get a DSO.
Pocket size, charges off a USB port, open source (although I've never used anything put the OS it came with), built is sig gen.
I love it.
<EDIT> And by itself (i.e., not hooked to a grounded USB source for power) you don't have to worry about introducing ground loops into the circuit your testing.