- Controls how the effect responds to the input signal.
- Controls the amplitude of the .
- Drive (Down/Up)
- Selects the direction of the filter sweep: down- or upwards.
This effect was first called T-Wah, then Touch Wah and again T-Wah.
- (2007-03-16) Boss T-Wah TW-1 Effects Pedal by psymeg
- (2009-01-10) Gear Demo - Boss TW-1, T Wah by Crxshdxmmy
- (2012-05-12) Boss TW-1 T wah twah demo, Msm Workshop by MSM Workshop
- (2013-12-10) ??????BOSS TW-1 T Wah?BOSS COMPACT PEDAL 100th ANNIVERSARY!!? by Chuya Online
- (2015-09-01) Boss Pedal review 54: TW-1 Touch Wah by Cameron Johnson
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