Roland JUNO-Di Editor Owner's Manual page 11

LFO (Low Frequency Oscillator)
Use the LFO to create cyclic changes (modulation) in a sound. The
JUNO-Di has two LFOs. Either one or both can be applied to effect the
WG (pitch), TVF (filter) and/or TVA (volume). When an LFO is applied
to the WG pitch, a vibrato effect is produced. When an LFO is
applied to the TVF cutoff frequency, a wah effect is produced. When
an LFO is applied to the TVA volume, a tremolo effect is produced.
How a Rhythm Set is Structured
Rhythm sets are groups of a number of different percussion instrument
sounds.
Since percussion instruments generally do not play melodies, there is
no need for a percussion instrument sound to be able to play a scale
on the keyboard. It is, however, more important that as many
percussion instruments as possible be available to you at the same
time.
Therefore, each key (note number) of a rhythm set will produce a
different percussion instrument.
Rhythm Set
Note number 98 (D7)
Note number 97 (C#7)
Note number 36 (C2)
Note number 35 (B1)
Rhythm Tone (Percussion instrument sound)
WG
Pitch
Envelope
* There are four wave generators for each rhythm tone (percussion
instrument sounds).
* LFO is not included in the rhythm tones (percussion instrument
sounds).
TVF TVA
TVF TVA
Envelope Envelope
Calculating the Number of Voices Being Used
The JUNO-Di is able to play up to 128 notes simultaneously.
The polyphony, or the number of voices (sounds) does not refer only to
the number of patches actually being played, but changes according
to the number of tones used in the patches, and the number of waves
used in the tones. The following method is used to calculate the
number of sounds used for one patch being played.
(Number of patches being played) x (Number of tones used by patches
being played) x (Number of waves used in the tones)
For example, a patch that combines four tones, each of which use two
waves, will use eight notes of polyphony at once. Also, when playing
in Performance mode, the number of sounds for each part is counted
to obtain the total number of sounds for all parts.
How a Patch Sounds
When the JUNO-Di is requested to play more than 128 voices
simultaneously, currently sounding notes will be turned off to make
room for newly requested notes. The note with the lowest priority will
be turned off first. The order of priority is determined by the Patch
Priority setting (PRIORITY; p. 29).
Patch Priority can be set either to "LAST" or "LOUDEST."
When "LAST" is selected, a newly requested note that exceeds the
128 voice limit will cause the first-played of the currently sounding
notes to be turned off.
When "LOUDEST" is selected, the quietest of the currently sounding
notes will be turned off. Usually, "LAST" is selected.
Note priority in Performance Mode
Since Performance mode is usually used to play an ensemble
consisting of several patches, it is important to decide which parts take
priority. Priority is specified by the Voice Reserve settings (VOICE
RESERVE; p. 60). When a note within a patch needs to be turned off
to make room for a new note, the Patch Priority setting of the patch
will apply (PRIORITY; p. 29).
Voice Reserve
The JUNO-Di has a Voice Reserve function that lets you reserve a
minimum number of notes that will always be available for each part.
For example if Voice Reserve is set to "10" for part 16, part 16 will
always have 10 notes of sound-producing capacity available to it
even if a total of more than 128 notes (total for all parts) are being
requested.
When you make Voice Reserve settings, you need to take into account
the number of notes you want to play on each part as well as the
number of tones used by the selected patch (VOICE RESERVE; p. 60).
It is not possible to make Voice Reserve settings that would cause the
total of all parts to be greater than 64 voices.
Overview
11