Meng Qi APCS Used custom built Aluminium Phosphate Crystal Simulation. Circuit by Peter B, PCB by legendary synth maker Meng Qi. 922RMB. Final price, no haggling. This is a cool noise machine with light sensors and modular style routing to change the signal path. 9v. Enclosure is plexiglass. No major scratches and functions well. 6.5 mm output. Comes with mini-flashlight and stackable banana cables. Selling because no longer using it. Available for pick up in Beijing. Free shipping within China. PM for more details.