mattpitts74 wrote: 
> I think I may have figured out the problem, as others using the NAD 3020
> digital amp have also experienced this problem too,  It appears that
> when the NAD goes into standby, it powers off its USB port and thus
> electrically disconnects from the Pi USB port, as if the cable were
> pulled, so when I switch the NAD back on and try to play no sound, and
> the only way to get it working is to restart with the amp powered on and
> then it all works again.  Apparently this is something to do with a
> hot-swappable issue, does that make any sense to anyone?

Try this then, if NAD regard the USB input as digital, it may work. 

> AUTO SENSE
> Auto sense feature enables the D 3020 to wake up from standby mode and
> starts operation by selecting OPTICAL 1 source or the last digital
> source
> before going to standby mode.
> CONDITIONS FOR AUTO SENSE
> • For Auto Sense to work, Auto Standby must be set to ON with D 3020
> going first to standby mode.
> • If IR Learning with TV remote control is successfully completed and
> with
> D 3020 going to standby mode, auto sense is activated upon detection
> of active digital input only from OPTICAL 1 input.
> − With this condition, D 3020 wakes up and automatically switches
> to
> OPT1.
> • If no IR Learning is conducted, auto sense is activated upon detection
> of active input from the last source (limited only to the digital
> sources)
> before the D 3020 goes to standby mode.
> − With this condition, D 3020 wakes up and automatically switches
> to
> the last selected digital source prior to the D 3020 going to standby
> mode.


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