The right pitch, exactly when you need it. Before a rehearsal, before a soundcheck, before the first note of a warmup — a reference tone grounds the room. SUS4 Pitch Pipe is a clean, chromatic pitch reference that covers every note, with a drone mode that holds a tone as long as you need it. Singers use it for vocal warmups. A cappella groups use it before the downbeat. String quartets use it for the A before they check the tuning of everything else. It is a simple, reliable tool that never runs out of reeds. • Full chromatic range — every note, every octave • Drone mode for sustained reference tones during warmups • Ideal for vocal warmups and a cappella groups • Clean waveform with gentle attack — not harsh on the ear No account. No mic access needed. Runs on-device, always.