A Reese bass gets its characteristic movement from overlapping glide notes that trigger portamento

The defining feature of a Reese bass sound is its continuously morphing, wobbling tone. In FM synthesis (and analogously in any synth), this is achieved by overlapping MIDI notes at different pitches — the second note begins before the first ends — combined with monophonic portamento (glide). When the synth is set to mono and portamento is enabled, each overlapping note causes the pitch to slide, producing the characteristic Reese “movement.” Without overlapping notes, the synth simply plays static pitches with no glide. The longer the portamento time, the slower the slide; the degree of pitch difference between notes determines how dramatic the movement sounds. This technique is genre-defining: the Reese bass is identified by this continuous pitch-gliding quality, not just its timbre.

Examples

In a DAW, create two MIDI notes at different pitches (e.g., G#2 and G#3) where the second begins before the first ends. Set the synth to mono and enable portamento. The synth will glide between the notes rather than jumping — this creates the Reese movement even at extreme pitch differences.

Assessment

Describe the MIDI setup (note overlap and synth settings) needed to produce Reese-style glide movement; then explain what happens if portamento is turned off or the notes do not overlap.