Musical and app terminology
Time
Beat: the meter's counting unit. Bar: one group of beats defined by the time signature. BPM: beats per minute for the displayed tempo unit. Loop: a section that repeats. Quantize/snap: move events toward a timing grid. Triplet: three evenly spaced notes in the time normally occupied by two of the same value.
Notes and expression
Fret: position on a string, with 0 meaning open. Semitone: one chromatic pitch step. Velocity/strength: how hard a note or hit is struck. Sustain: continued sound after an attack. Tie: continuation of one note without a new attack. Voicing: the pitches and string positions used for a chord.
Sound
Gain: signal amplification; before distortion it can also change breakup. Dry: unprocessed signal. Wet: effected signal. Mix: blend or balance. Bypass: skip a processor while keeping its settings. EQ: frequency balance. Cutoff: frequency at which a filter changes its response. Resonance: emphasis near a filter's cutoff.
RiffJam objects
Session: the arrangement and its instruments. Part: an instrument's notes or reusable musical material. Sound preset/rig: sound settings and effects. Take: one recorded performance pass. Automation: recorded changes to sound controls. Vault: your saved library. Backing cache: regenerable audio prepared from editable musical data.