Bank Select Messages (CC 0 MSB & CC 32 LSB)
The two-stage continuous controller message protocol extending synthesizer patch selection from 128 programs up to 2,097,152 patches.
# Mathematical Formula & Architecture
Logic SpecificationSelection Sequence: CC 0 (Bank MSB) -> CC 32 (Bank LSB) -> Program Change (0-127). Total Banks = 128 * 128 = 16,384 banks.
def select_synth_patch(output, channel: int, bank_msb: int, bank_lsb: int, program: int):
"""Sends standard 3-message Bank Select and Program Change sequence."""
output.send([0xB0 | channel, 0, bank_msb]) # CC 0 Bank MSB
output.send([0xB0 | channel, 32, bank_lsb]) # CC 32 Bank LSB
output.send([0xC0 | channel, program]) # Program Change (0-127)# Deep Technical Analysis & Historical Context
The original 1983 MIDI specification provided only 7 bits for the Program Change command (0xC0 to 0xCF followed by a single byte from 0 to 127), limiting synthesizers to a maximum of 128 patches. As romplers and multi-timbral sound modules arrived in the early 1990s (like the Roland JV-1080 with thousands of expansion card waveforms), 128 patches became hopelessly inadequate. The MMA introduced Bank Select using CC 0 (Most Significant Byte) and CC 32 (Least Significant Byte). Transmitted immediately prior to a Program Change command, Bank Select switches the synth's internal memory page, granting instant access to up to 16,384 banks of 128 patches each.
Common Studio Pitfall & Hardware Hazard
Many synths do not switch soundbanks when receiving CC 0 / CC 32 until the subsequent Program Change byte is received, causing producers to think their bank select message was ignored.
# Hardware Synthesizers Using This Technology
Click any synthesizer below to explore its specific memory protect routine, factory soundbanks, and Web MIDI SysEx cloud backup engine:
# Frequently Asked Engineering Questions
Why do some synths only listen to CC 0 or CC 32?
Synths with fewer than 128 banks often ignore CC 32 (LSB) and map all expansion cards and preset banks strictly across CC 0 (MSB).
Related Engineering Concepts
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