what is the best way to add remote control

Myoussif,

Since your amp has an electronic power switch that doesn't
"latch" - i.e. stay on without power - and you don't have
a 12V trigger - then manual operation is the only way.

Gregory Greenman

The best way is not to add a remote control if you care about the sound quality.

Rmihai,

If he had an amp with an on/off switch that "latched" - i.e.
stayed on - then a remote control could be used to turn on the
power.

Since the remote control just switches on the power - it's not
in the signal path - and would not degrade sound quality.

Dr. Gregory Greenman
Physicist

Do you have any kids? Maybe they can get you a beer while they are up.