Pitch Bias - Yamaha DX7s Owner's Manual

Pitch Bias

With the new Pitch Bias feature you can use After Touch or the Breath Controller to
control the pitch of a voice. When Pitch Bias is set to 0, there is no pitch change. Positive
Pitch Bias settings result in an upward bend, while negative Pitch Bias settings cause the
pitch to bend down. The range is -50 ~ +50.
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