From a review of the Playtime Products "Beat Box" (designed in 1987) on matrixsynth.com:
"Unique and awesome 80s sounds - Start your own Noise/Dance group with this rare piece of equipment.. This is a monophonic but 4 parts multitimbral drum machine - WEIRDEST SOUNDS EVER from any drum machine! The bass drums are something like medium 909 bass drums tripped up with distortion, snares and hihats, creating strange pieces of noise, also with some truly bizarre space sounds to make some really weird and hard breakbeats! I don't know exactly how these sounds are made, there is one custom IC inside the machine. Anyway, the sounds are very weird, original and great."