Anyone know if TL072 dual op-amps would be adequate for this mod? Here's the datasheet(also shows the TL071 and TL074): http://www.ti.com/lit/ds/symlink/tl071.pdf
EDIT: Just out of curiosity, I tried the older Audio Mod with no op-amp on a RetroN3 Version 2 and it looks promising. The only problem I've noticed is some distortion on low-frequency sounds(and, of course, the sound is very weak). Is this because the FM signal is too loud? Would I need to change the resistor value at the FM inputs to eliminate the distortion or would something else need to be changed?