Incorporates a Beep amplifier and 3 channel sound synthesiser.
"The 3 channel sound synthesiser adds a totally new dimension to sound on your Spectrum. It allows you to program your own music with harmonies, explosions, zaps, chimes, whistles and an infinite range of other sounds over 8 octaves. Based on the popular AY-3-8912 sound chip it gives you complete control (from Basic or M/C) over 3 channels of tone/or white noise, plus envelope and volume control. It comes with its own pod mounted 4" speaker."