Yamaha TG500 - Manual (Page 233)

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UTILITY MODE / WAVE EDIT MODE / 1: System
1-2: EFFECT BYPASS
1-2: EFFECT BYPASS
Effect Bypass
Range: off, on
When effect bypass is turned “off” the TG500 effect system is active and
the effect sound will be delivered via the TG500 outputs. When turned “on,”
the internal effect system is completely bypassed and only the direct (dry)
sound of the tone generator will be delivered via the outputs.
Use the “on” setting if you plan to use external signal processing equipment
with the TG500.
This parameter turns the entire TG500 effect system on or off.
UTL SYSTEM
Effect Bypass= off
[UTILITY/SELECT] -> 1: System -> [ENTER] -> [PAGE] -> 1-2: Effect Bypass -> [ENTER]