[LAU] Awful noise out of FA-66

[Pieter Palmers]

Ken Restivo wrote:
> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
> 
> I plugged my spiffy new linux laptop into an amp tonight and used it
> as an instrument with a band, using an M-Audio Axiom49 as a MIDI
> controller.
> 
> Not everything works yet on this new machine, but what I needed most
> for tomorrow night's show (specimen, with a couple specialized
> samples), worked fine.
> 
> Except for the noise. The FA-66 was producing the most awful, buzzy,
> glitchy digital background noise.
> 
> I ran the following chain, and got horrible aliasing noise: Laptop ->
>  ExpressCard Firewire -> FA-66 -> SWR bass/keyboard amp
> 
> The FA-66 is powered by its wall-wart, since the ExpressCard doesn't
> power it (even though it is a 6-pin connector).
> 
> My question is this. What's up with that awful noise?

When googling around I found at least one other person having the same 
issue with the FA-66.

I've noticed similar noise at some places with my QuataFire line out's.

Some things to try:
- unplug the power supply of the laptop (for test)
- put a DI box inbetween the amp and the edirol (enable ground lift)
- use another power supply for the edirol (preferably a transformer 
based one).


Pieter