CS9236-CQ View Datasheet(PDF) - Cirrus Logic

Part Name

Description

Manufacturer

CS9236-CQ

Single-Chip Wavetable Music Synthesizer

Cirrus Logic 

CS9236

Channel Voice Messages (Continued)

PROGRAM CHANGE

CnH

ppH

n = MIDI channel number

pp = program number

0 - FH (1 - 16)

00 - 7FH (1 - 128)

For the “melodic instrument channels” (MIDI channels 1 - 9, 11 - 16), the PROGRAM CHANGE message is used to select

the melodic instrument to be used on a specified MIDI channel. MIDI channel 10 is used for the General MIDI percussion

set, and PROGRAM CHANGE messages on MIDI channel 10 are ignored.

In this document, the melodic instruments are numbered from 1 through 127 (MIDI program number value +1). The Pro-

gram Change message does not affect notes in progress. Notes in Progress continue to sound using their original instrument

selection. Note On messages received after the Program Change message will sound using the new instrument selection.

CHANNEL PRESSURE (Channel Aftertouch)

DnH

vvH

n = MIDI channel number

vv = value

0 - FH (1 - 16)

00 - 7FH (0 - 127) <OFF>

In the CS9236, the MIDI Channel Pressure message may be used to control the pitch modulation (vibrato) level on a speci-

fied channel. Recognition of CHANNEL PRESSURE may be enabled or disabled in the CS9236 using MIDI System Ex-

clusive messages. Recognition of CHANNEL PRESSURE is disabled by default (CHANNEL PRESSURE messages are

ignored). When recognition of CHANNEL PRESSURE is enabled, the CHANNEL PRESSURE value is summed with the

current MODULATION WHEEL value and with the default modulation level defined for the selected instrument on the

specified channel to determine the actual vibrato level applied to the sound. When enabled, CHANNEL PRESSURE at

maximum value will contribute a modulation (vibrato) depth of 50 cents. The response curve is linear. The total depth, re-

sulting from CHANNEL PRESSURE, MODULATION WHEEL, and default modulation level, may be as high as one semi-

tone. When enabled, CHANNEL PRESSURE affects all notes playing on the specified channel. Pitch modulation in the

CS9236 is implemented using independent low frequency oscillator (LFO) implementations for each note.

Some of the instruments implemented in the CS9236 include a default pitch envelope (the pitch of a note begins slightly

sharp or flat, and then ramps to the final pitch for the note). For notes with default pitch envelopes, pitch modulation (vibrato)

will begin only after the pitch envelope has reached final pitch.

DS214PP11

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