The Effect Loop board is the MetroAmp Effects Loop from Metro Amps. The kit costs $75 or you can buy the board only for $60 but you will need a 2 watt 56 Kohm metal oxide resistor in series to the B+ input on the Effects board. This resistor is included in the kit. You can download the installation instructions from their website. The Standby Switch is a Carling Technologies DPST switch SKU P-H525. Amplified Parts carries it for less than $6. I added a Cliffs note summary of these mods in text in one of my comments below but I highly recommend you watch this video in its entirety before attempting these mods. One last thing is that I made this video to help fellow DSL15 amp owners. I am not responsible for any damages that may occur to your amplifier while performing these mods. Proceed at your own risk. I hope you find this video useful and thanks for watching...