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The following explains each block of the FM sound source configuration diagram.

SOUND STACK
Stores the output of each slot. The SCSP slot can input the output value (data in the sound stack) of the two slots.

Averaging calculator
Each slot has two modulation inputs, X and Y. In order to combine these two inputs into one, it is necessary to perform addition. To prevent the addition result from overflowing, there is a method of adding after the two inputs are multiplied by 1/2. By adopting this method, SCSP converts two input data into one output data.
Suppose the input data is XD and YD, and the output data is ZD.

Figure 4.29: Averaging formula

Since this is the same as the formula for obtaining the average value, this calculation block is called the averaging calculation block.

MDL [Modulation level (variation)]
Used to adjust the degree of FM applied by external slot input.

Phase adder
Adds (subtracts) the phase value generated by PG and the phase value generated by the MDL calculation via the averaging calculation unit. Whether to perform addition or subtraction is determined by the loop mode and loop status.

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