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Ha, double-precision NE5532s, great idea. They're usually used in HI-FI audio products and you used it, inside a guitar effects module!
Good idea it might be, but using a transistor which works in linear section to drive a fan is likely to generate lots of heat. As guitar amp geeks, most of us have several Op-Amps and it might be a better idea to build a PWM(pulse width modulation) speed controlling circuit instead of a linear one. As temp probes, LM35 is a great choice for its voltage output exactly mapped to the centigrade temperature. Feeding the signal and another sawtooth or triangle signal - it could be easily generated by using a NE555 timer chip - into the opamp(let it work as a comparator) and use mosfets (try irfz44 or 75nf75) as switching components. Hope it'll work well!
You can start with combining a booster(as the input stage), a distortion pedal, a speakersim(Visit for the PCB/schematic) and an amplifier module which is sold on Taobao or Amazon or other Internet shops
I do not know what does the circuitry of CODE amps exactly consist of. However, it's a good idea to try finding a  line-level signal around the amp chip using a VU meter or a pair of computer speakers with probe made of alligator clips, 1/8'' TRS lines and a 3.3uf cap(in order to block out the DC bias which would fry your speakers) . Once you've probed out the signal successfully, you can then find the connection of it to the preamp, cut it, and put the LOOP circuit between the gap. Opamp buffers might be added in order to deal with the impedance problems. Good luck!
Amplifier Discussion / Re: Power on LED.
October 14, 2018, 09:04:53 AM
Green LEDs, especially extra-bright ones, are no doubt battery eaters. Using a red one with a resistor with higher resistance (Just let the LED glow slightly) will work.