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JV/XP Modes & Structures

Patch Mode
A single sound with it's own waveforms and effects.   A patch responds to the designated MIDI receive channel.

Performance Mode
Up to 16 parts, each responding to any MIDI channel, all sharing the same effects.   Performances can be selected with MIDI messages on the control channel (which takes precedence over any patch using the same channel).   Up to 15 different patches and one rhythm set can be used at a time.

Rhythm Mode
Even though you can choose this mode from the front panel, it is actually a special performance mode, using only part 10, which uses any single rhythm set.

General MIDI (GM) Mode
A special performance mode using preset bank D sounds, that ignores all but "basic" MIDI messages.   There are 128 different patch sounds available using the GM patch layout, and only 2 rhythm sets.   Up to 15 different patches and one rhythm set can be used at a time.

There are several components that are used to build up different sound structures.

Waveform
This is the most basic sound in the JV.   It is like a raw recorded and looped sound sample.   Waveforms are used to build patches, and although the raw wave cannot be modified, the way they sound is modified by patch settings.

A few special waveforms, called menus, have different sounds on different notes.   Also, some menus, called sets, only respond to a few designated notes.   They are designed to be combined in a patch with other sets, so that all notes are covered, each producing a different sound.   These waveforms are commonly used to create drum kits in a patch.

Tones
A tone is a single waveform and its associated settings inside a patch.   Each waveform can have it's pitch, tone and volume modified extensively.   Tones in a patch can have restricted note and velocity ranges to achieve keyboard note and velocity splits.   Without restriction, tones are layered.

Patch
A patch is a combination of up to 4 tones, and all of the settings that affect how they sound and how they are combined.   A few special patches can use waveform menus and sets (or even tones with split key ranges) to give different sounds on different notes.   These are often used for limited drum kits that are not restricted to part 10 of a performance.

Here's a diagram of patch contents:

Part
A part is a patch number, and up to 16 parts make up a performance.   All parts share the effects chosen for the performance, but each part has its own effect level settings.   Each part can be set to respond to any MIDI channel, and part 10 is fixed to use rhythm sets instead of patches.   Note that part settings (stored in a performance) only list the patch numbers to be used, and not the patch settings themselves.

Performance
Is a collection of up to 16 parts.   Parts can be layered by setting them to respond to the same MIDI channel.   Or you can set parts to different channels to be able to use different sounds at the same time.   Note that the settings in a performance only list which patches and rhythm set to use; not the actual settings inside each patch and rhythm set.

Here's a diagram of performance contents:

A Rhythm Set is a collection of percussion sounds.   Each sound responds to its own note, and consists of a single waveform, with its own pitch, tone, level and effect send settings.

Here's a diagram of rhythm set contents: