The TightBoost is a cleaner version of the TightDrive, and includes a parked wah tone, and the Tight attack control.

The TightBoost™ version of the TightDrive overdrive pedal has less gain, more volume and provides a cleaner boost to drive your amp harder.  Along with the popular Tight control, it also has a Mid boost control that gradually adds a Parked Wah tone.  This makes it easy to add a controlled amount of ‘vowel’ tone to your boost.