The basic architecture is that of a conventional VCO-VCF-VCA string per layer. However, the VCF actually consists of two filters, one low pass and one high pass. These could be coupled to form a bandpass filter, but each half could be set to track the keyboard at different rates, so that the passband varied across the keyboard span. The filters excelled at creating brass sounds; the CS80 and other models of the CS line were heavily used for this in the day. They could also, with the variable passband, create sounds that were delicate and chime-like in the upper registers, and simultaneously big and meaty in the bass. The synth also contained several built-in effects, some of which were borrowed from Yamaha's line of electric organs.