Common tracker effects include volume, portamento, vibrato, retrigger, and arpeggio. The instrument also had controls for glissando, portamento, and "timbre attack" (a type of chorusing). All voices may be shaped by 13 preset envelopes, portamento, and vibrato. String-bending for example may be used to produce a glissando or portamento. In this way, the glissando differs from portamento. Kreisler makes considerable use of portamento and rubato. Such a legato style of playing can also be associated with portamento. A player can use this to create a vibrato or a portamento effect. Furthermore, Ensoniq ESQ-1 features amplitude modulation, oscillator sync, monophonic mode, and portamento. The physical keyboard action includes velocity, aftertouch, and portamento. Version 1.06 added a unison mode, an automatic portamento, and new Voltage-controlled filter parameters. The Portamento keyboard overrides the solo keyboard if used simultaneously. The sentimental second section features a solo violin, with frequent use of "portamento". It came in four, six, and eight-voice models with polyphonic portamento, and sample and hold. Juno features lacking in the JX-3P include portamento and a second chorus mode.