Line 6 DL4 MkII Delay Modeler MIDI CC chart, NRPN and OSC map¶
The Line 6 DL4 MkII Delay Modeler MIDI implementation: 22 CC, each named, for Claude (MCP), SuperCollider or any OSC app.
| Device | Line 6 DL4 MkII Delay Modeler |
|---|---|
| Vendor | Line 6 |
| OSC prefix | /dl4_mkii_delay_modeler |
| Source | 📦 Derived from MIDI Guide (community CC/NRPN data) |
| Firmware | unknown |
| Revision | per pencilresearch canonical CSV |
| Upstream | pencilresearch |
| Data licence | CC-BY-SA-4.0 — MIDI Guide (https://midi.guide) by Pencil Research and contributors |
| Driver file | devices/line-6/dl4_mkii_delay_modeler.json |
Not tested on the device yet
This driver comes from documentation or community data and has not been checked on real hardware. If you own one, a quick test and a pull request promoting it helps everyone — see CONTRIBUTING.
How do you control it?¶
Find the MIDI ports, then start the bridge with this driver:
osc-bridge detect # prints the ready-to-run line for what is plugged in
osc-bridge run --device devices/line-6/dl4_mkii_delay_modeler.json --out-port <N> --in-port <M>
Then send OSC to 127.0.0.1:7777, for example:
From Claude or any MCP client, the osc-bridge mcp server exposes this driver as dl4_mkii_delay_modeler: ask “what can the Line 6 DL4 MkII Delay Modeler do?” and it reads this map with list_routes. See the MCP guide.
MIDI CC and NRPN parameters (22)¶
| OSC address | CC | NRPN (MSB/LSB) | Range | Nature | Section |
|---|---|---|---|---|---|
/dl4_mkii_delay_modeler/parameter_control/delay_model |
1 | 0–29 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/reverb_model |
2 | 0–15 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/emulate_expression_pedal |
3 | 0–127 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/preset_bypass |
4 | 0–127 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/delay_time |
11 | 0–127 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/time_subdivisions |
12 | 0–8 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/delay_repeats |
13 | 0–127 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/delay_tweak |
14 | 0–127 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/delay_tweez |
15 | 0–127 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/mix |
16 | 0–127 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/reverb_decay |
17 | 0–127 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/reverb_predelay |
18 | 0–127 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/reverb_delay_routing |
19 | 0–2 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/parameter_control/reverb_mix |
20 | 0–127 | continuous | Parameter control | |
/dl4_mkii_delay_modeler/looper_control/classic_mode_looper_on_off |
9 | 0–127 | continuous | Looper control | |
/dl4_mkii_delay_modeler/looper_control/record_overdub |
60 | 0–127 | continuous | Looper control | |
/dl4_mkii_delay_modeler/looper_control/play_stop |
61 | 0–127 | continuous | Looper control | |
/dl4_mkii_delay_modeler/looper_control/play_once |
62 | 0–127 | continuous | Looper control | |
/dl4_mkii_delay_modeler/looper_control/undo_redo |
63 | 0–127 | continuous | Looper control | |
/dl4_mkii_delay_modeler/looper_control/tap_tempo |
64 | 0–127 | continuous | Looper control | |
/dl4_mkii_delay_modeler/looper_control/forward_reverse |
65 | 0–127 | continuous | Looper control | |
/dl4_mkii_delay_modeler/looper_control/half_speed |
66 | 0–127 | continuous | Looper control |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /dl4_mkii_delay_modeler/note/on <note> <velocity>, /dl4_mkii_delay_modeler/cc/<number> <value>, /dl4_mkii_delay_modeler/pitchbend <0-16383>, /dl4_mkii_delay_modeler/program_change <n>.
Limitations¶
CC/NRPN only. SysEx (preset management, display control, bulk dump/load, vendor-proprietary opcodes) is NOT covered by pencilresearch. To extend this device with SysEx, sniff the vendor editor, add `sysex.header/footer` + `commands` blocks, and use `update_device.md` PR template.
Frequently asked questions¶
How many parameters of the Line 6 DL4 MkII Delay Modeler can be controlled over MIDI?
SynthHub's map of the Line 6 DL4 MkII Delay Modeler lists 22 MIDI CC parameters, each with its number, range and a readable name; the full chart is on this page.
Can an AI agent like Claude control the Line 6 DL4 MkII Delay Modeler?
Yes: SynthHub's hosted MCP server knows the Line 6 DL4 MkII Delay Modeler's MIDI map, and its browser relay lets the agent send it parameter changes or load a sound, each sound change confirmed by you.