I recently bought a VXpocket v2 and managed to get it working with alsa 
0.9.4, but I'm having a few problems with it.

Whenever it's in use by an application, system CPU usage goes up to 
40-70% and stays there, depending on the application.

If I run pd with -alsa, I get "audio I/O stuck... closing audio" unless 
I add -noadc.  Pd with -oss doesn't give that error, but tends to lock 
up the system.

Is it possible to control the headphone level independently of the 
normal output levels?  Also, the headphone output has a terrible ground 
loop hum when my laptop and speakers are attached and plugged in.  The 
same hum can also be heard in the normal outputs, but it's much 
quieter.  My speakers have balanced inputs and are attached by balanced 
cables.

I'm guessing the buzz is a hardware issue I'll have to live with or fix 
with an adaptor of some kind.  On the other hand, getting rid of the 
buzz was one of the main reasons I decided to buy a separate audio 
interface, so this is rather troubling.  I chose the VXpocket over a 
USB interface (probably the Audiophile USB) because I read that the 
latency with current USB 1.1 interfaces is somewhat high, and I'd like 
to be able to play my guitar through it.  Is this true with alsa?  
Also, are USB interfaces with external power supplies immune to ground 
loops and interference noise (e.g. from other USB devices)?

Thanks,
Ben



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