The sequencer controls 8 switches via the parallel port. It also controls the pitch of the attached device via a photo resistor in front of the computer monitor. Each switch can be given a name, in the screen shot the names are the animals from the Habitat Intercom device, a.k.a. the infamous Creatoy animal bus toy.
Every sequence is build of a number of patterns, each consisting of 4 bars of 4/4. The patterns are shown in a grid with one line for each of the 8 switches, and three lines are used for pitch control. For each switch you can turn on or off every beat by clicking the beat in the grid, as indicated by the light blue squares. The pitch is represented by different greyscale values, ranging from black to white. As playback of the pattern progresses the color of each beat is then copied to the larger grey square at the right, where the photo resister is mounted in front of the monitor.
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