QSI QSI thats the word cutting edge new technology, ease of intallation, sound quality, price are all there. Take a look for yourself go to you tube in videos plug in 7485jerry and hear the sound, also comparison to Phoenix sound there also pnp board and g-wire together are around $208 depending on where you buy. There are 28 plus controllable functions from the t-9000 throttle, there is a advertising page in dec Garden RR Mag full blue page ad on what you can do with this system with what you have or need to purchase go to blueregal.angelfire.com and follow links to see whats there. Im fully sold on the items qsi pnp sound board, g-wire, airwire t9000 throttle. Never had control like this with my 2 complete aristo train engineer setups. Check them out QSI solutions!!! Consumer that is sold on the product.