Since the release of the FALCON series, digital signal processing has been on everyone's lips. Although the DSP-Kit is not (yet) based on the FALCON-DSP, it allows a wide range of simulations of digital signal processing systems - even on "normal" ST/TT's. An ingenious graphical representation of signal processing components and their signal flow circuitry allows (besides more abstract topics like control engineering) also the audible (!) reproduction of sounds (e.g. sound synthesis) on the monitor speaker, a D/A converter on the parallel port (building instructions included), or the DMA sound unit of the STE/TT. Filters of first and second order, characteristic curves, rectifier, sample & hold, signal and spectral display (FFT) incl. optional distortion calculation, delay, integrator, differentiator, subsystems and many more are available. Everything is fully GEM compliant (with WINX max. 31 windows) and very easy to use. The ideal tool (or even the ideal playground) for communications and control engineers who want to "try it out" themselves.