Unit
RolandSC-8850
roland-sc8850-01
- Identity reply
- F0 7E 10 06 02 41 42 00 00 06 00 00 00 00 F7
- Specifications
- ClaimedGM · GSMeasuredGS
- 854Regions
- 45,611Addresses
- 149Heard
- 19Banks
- 461Blocks
Roland SC-8850
Roland SC-8850 roland-sc8850-01
Type an address, a byte of one, or the name of a MIDI message.
One physical unit, measured on one path, on the days these runs were taken. What follows is how much of it has been reached, what was asked of it, what stood between it and the archive, and how the measuring itself checked out.
Coverage
How much of the address space each question was actually put to. The whole is every address that answered a read at all; a bar that stops short is a run that stopped, not a unit that ends there.
149 of the 671 listened to changed the sound. 522 did not — which is a finding about the note it was asked with as much as about the address.
roland-sc8850-01/Stages measured
Each is one command that produced records, and each puts a different question to the same unit. An underlined name has an entry in the glossary.
- alias-scan
- balance
- block
- boundary
- contrast
- decay
- efx-map
- efx-motion
- efx-params
- efx-sort
- hold-probe
- motion
- offsets
- port-read
- port-send
- power-on
- repeat
- reset-probe
- sweep
- tone-map
- transfer
- vibrato
- watch-set
- window-probe
- write-probe
Measurement chain
What stood between the instrument and the archive. A measurement is of a unit through a path, and the path is part of the finding.
- midi_interface
- Focusrite Scarlett 4i4 4th Gen
- midi_cables
- Roland RMIDI-B3 x2
- midi_wiring
- interface MIDI OUT -> unit MIDI IN 1; unit MIDI OUT 1 -> interface MIDI IN
- audio_cable
- Roland RCC-3-2R28
- audio_wiring
- unit OUTPUT 1 L -> interface INPUT 3; R -> INPUT 4 (rear, fixed gain)
- unit_volume
- maximum (hard stop, exactly reproducible without markings)
- capture
- CoreAudio HAL AudioDeviceCreateIOProcID, 48000 Hz, 6 ch, float32
- capture_note
- ffmpeg -f avfoundation silently loses about 11 percent of samples on this path and must not be used.
Measurement health
What the chain was checked against while it ran. These are readings on the measuring, not on the unit.
- sysex_reply_checksums
- 6/6 verified
- repeat_read_identical
- 100/100
- sysex_round_trip_median_ms
- 23.4
- sysex_round_trip_range_ms
- 20.2 – 25.1
- interface_loopback_sysex_bytes
- 203
- interface_loopback_result
- byte-exact
- capture_timeline_ratio
- 1.0004
- capture_timeline_stddev_ms
- 2.51
- capture_dropouts
- 0
- noise_floor_dbfs
- -90.3
- peak_dbfs_at_maximum
- -25
- peak_conditions
- CC7=127, CC11=127, velocity=127
- capture_open_latency_ms
- 650
- capture_open_latency_note
- Stream open to first block. A stimulus timed from the call to the recorder rather than from the first block sounds before anything is captured, and only its tail is recorded -- at the right length, with no dropouts, and healthy by every other check.
- take_repeatability_db
- -56.4
- take_repeatability_note
- Two takes of one struck note, aligned to a fraction of a sample and levelled, on program 0 with no effect on. 0.4 to 2.3 dB above the floor two takes' noise would leave.
- take_level_agreement_db
- 0.001
- trigger_scatter_ms
- -3.6 – 0.3
- chain_frequency_wander_ppm_over_20s
- 10
- chain_frequency_wander_note
- An upper bound, not a reading: every voice measured passed through the same converters, so the chain cannot wander more than the least wobbly of them does.
First published2026-09-01