PG contributor Tom Butwin explores the new BOSS XS‑100 Poly Shifter—an 8-octave powerhouse that lets guitarists and bassists go from subtle drop-tuning to full-on pitch chaos with expression pedal and MIDI control. From transforming a standard guitar into a baritone to turning a 4-string bass into a five-string monster, this pedal offers both inspiring sounds and real gig-day utility.
BOSS XS-100: Eight Octaves of Creative Mayhem
- YouTube
By Tom ButwinNov 06, 2025
Tom Butwin
Tom Butwin is a freelance contributor to Premier Guitar and also a singer, songwriter, guitarist, and YouTube personality. He studied at Oakland University, and he's released three original records, as well as two musical theater cover albums. (Yes, musical theater. You read that correctly.) You can connect with him at https://www.TomButwin.com.


























