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Originally Posted by seancostello  Some of the other 224XL Concert Halls seem to add chorusing to additional locations within the algorithm (Dark Hall), which implies that the 224XL had a few more cycles than the original 224. |
The 224XL service manual indicates that the program is 100 steps. However, the microcode actually could do 128 steps - the program counter is cleared by writing an address with bit 3 set to the I/O space. The 224 (non-XL) version shows the same sort of thing - the WCS resets the PC. Though many of the Lexicons have a 128-step program counter, not all of them actually use all 128 steps.
To multiply with sufficient precision to do a linear interpolate, I would guess that four lines of code are likely needed for each chorus certainly on something like the PCM70 or 480L. But the 224 uses a 6-bit multiplier which would be on the ragged edge of being able to pull off a chorus in two lines.