<5/7> Sound Development Manual / ■ About FM (Frequency Modulation)

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Sound Development Manual / 1. Overview

■ About FM (Frequency Modulation): FM is famous for Yamaha DX7 etc., but in FM of this system, the basic waveform is not limited to sine wave. Any waveform data in AIFF format can be used for both carriers and modulators. You can also freely configure the algorithm for the combination. It is also possible to change the degree of modulation depending on the velocity. The biggest problem with FM is that each carrier and modulator uses one slot, which reduces the number of simultaneous sounds. However, if you have one basic waveform (sine wave, etc.) as waveform data, you can create various tones by FM modulation, so if you do not want to increase the tone bank data due to restrictions such as RAM, the utility value is very high. It seems that.
The memory for sound is 1024KByte on the target board, but 512KByte on the actual machine. The part obtained by subtracting the sequence data, DSP program, work RAM, etc. from that will be assigned to the tone. Even if the sampling rate is lowered, it is practically impossible to put dozens of types of PCM waveforms with a large amount of data on the memory at the same time.

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