At its core, the Tonal Recall uses two Xvive 3005 bucket brigade chips, which gives the pedals repeats a warm, decaying quality. The pedals breakup offers something sweet and musical. As for the Tonal Recalls modulation section, the design employs three selectable waveforms (triangle, sine, square). This is perfect for shaping your repeats from a subtle wavering tape echo to stun gun later blasts using the Depth and Rate knobs.