Can anyone help? I'm a complete electronics novice bar a few 555 related build projects. I want to see if a note switching system could be built using transistor arrays. This is a pipe organ application so each keyboard has a set of inputs and these then output to magnets. The reason for the trasistor based switching is to allow small current inputs to control the larger current magnets and also to allow the coupling of keyboards, where one keyboard can operate more than one department but only in one direction. Also to allow for an extended set of magnets to be connected to a keyboard from two different points effectively an octave say apart so that two stops at different pitches can be gained from one set of pipes. It's a very simple application but the basic transistor switching systems are quite builky and I wondered if this bulk could be reduced by using a transistor array type chip. All suggestions gratefully received.