David is excellent at working on vintage and esoteric synthesizer equipment, particularly modular equipment. He was able to fix Aries modules that another well-known repair place threw its hands up at. He was able to trace out circuitry that was not reflected on schematics, such as on an early Sequential Circuits 800 sequencers, and a SCI 700 Programmer. Also very reasonable on his rate, as he enjoys working on this type of equipment. Will also do kit building and module construction, I believe. Very personalized service. Won't take just anything, only things that interest him, again such as esoteric modular and voltage-controlled equipment.