An FM-Jam device features a sonic character transformation module in combination with an FM transmitter module. The sonic character transformation module responds to an audio input signal from an audio source, including a guitar, keyboard or microphone, for providing a sonic character transformation module signal containing information about a transformation of the sonic character of the audio input signal. The FM transmitter module responds to the sonic character transformation module signal, for providing an FM transmitter output signal on a selected FM frequency for playing on any FM receiver, including a boom-box, car stereo, home stereo or the like. In one embodiment, the sonic character transformation module is a modeling/DSP pre-amp.