Tried it and the same thing happens, amplifier turns on and off before pc even with #11 at 255 ms. Everything else is working fine.
Sorry for the delayed responce.
The only other cause of this could be that the PC's +5v rail does not power up soon enough after the power signal is sent to the PC. This can only be corrected with a new chip.
If you like, we will send you a new microcontroller so you can see if this will correct it.
Yup, lets give that a try. It seems to do it twice sometime nows.