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The T stands for “Touch” and the early TW-1’s actually had the text Touch Wah written on them instead of T Wah. The TW-1 was replaced by the AW-2 in 1991. Together with the CS-1, the TW-1 is the only pedal to have a toggle switch. With only 2 controls, the TW-1 is very easy to control. The later autowah pedals have the added versatility of modulation but for the basic wah sound the TW-1 does the job without forcing the user to read the manual.

Version Differences

  • The earliest TW-1s was labelled Touch Wah instead of T Wah
  • There were both silver screw and black screw versions made
  • The T in TW-1 was first placed under the W in T Wah but later moved under the a
Boss TW-1 T Wah


  • Controls: Sens, Peak, 2-way Drive switch
  • Connectors: Input, Output, AC Adaptor
  • Current Draw: 6 mA (DC 9V)
  • Recommended AC Adaptor: ACA Series


  • Black – Made In Japan

The TW-1 was sold from July 1978 to May 1987.