Report for the ck2 v1.5 beta thread.
Setup: Cirklon 2 host port -> Miditech MIDIFACE 8x8 (direct, no hub) -> DIN 8
-> Lexicon PCM81. Cirklon routes host port 8 to its USB-device port 8
(Cirklon2 Port 8 on macOS). Only sender is PCM81 Control.
Reproduced 2026-10-18: switching patches in the editor, not slider dragging. After the switch the PCM81 stops replying. App: "No edit-buffer reply. Check MIDI ports and PCM81 SysEx On." Independent CoreMIDI probe (app disconnected), one whole edit-buffer request, 2.5 s: 0 bytes, 0 partials. A lone F7 then the same request: still 0 bytes.
Host OUT is working: pressing Connect sends the editor dump and the PCM81 panel shows "Midi data dump complete", but the Mac receives no reply. The PCM81 is alive and accepting data; the loss is on the host IN path.
Replugging the 8x8 at the Cirklon host port recovered the IN path briefly. A
40-request probe then logged 6 complete 1,421-byte edit-buffer replies, followed
by partial frames of 1,418, 1,412 and 1,418 bytes and a final stuck buffer of
1,065 bytes. A separate capture after a later replug saved a 969-byte partial
whose first 11 bytes match a new frame and whose byte 11 is 04 (the newly
selected Dyno TSC / Glide>Hall patch). It is a clean prefix, missing the final
452 bytes including checksum/F7. Replug recovers a burst, then the IN path wedges
mid-frame again. The stream debug page never shows an error.
Stream debug page at failure:
TX s:1 B:0 us:1 rst:00 errs:00 sus:00 I:00 ctr:0000 O:00 sof:0000
RX BUFF POS: h00t00 h00t00 h00t00 h00t00 h00t00 h00t00
No error/suspend/reset and head==tail on every displayed stream; the page does not show the stall.
Device descriptor details recorded in the report:
- 2 interfaces: AUDIO/AUDIOCONTROL and AUDIO/MIDISTREAMING.
- EP 0x01 OUT, EP 0x82 IN, both bulk, wMaxPacketSize 64, bInterval 0.
- Full-speed bulk, 8 virtual cables on the pair. On the HS DWC2 host this uses split transactions even directly attached.
Question: does the b3 split-transaction fix (the microframe-position one) cover a directly attached full-speed bulk device, or only the MioXL-on-hub path? If not, I can test a build and provide a Cynthion/USB capture.
Screenshots
No edit-buffer reply
Open the original app screenshot
Cirklon stream debug page at failure
Open the original stream debug screenshot