Which audio track positions do EBU R 123 and R 48 assign to mixes, international sound (M&E), audio description and multichannel content?

Partially verified: the curator re-read S8, S9; S4 was not re-read by the curator and rests on the producer's pinned reading. EBU R 123 (2009) tabulates audio track allocations for 2-16-track file exchange (e.g. 4b stereo mix on 1-2 with international sound or effects on 3-4; 4c mix plus audio description or foreign language; 8a/8b stereo plus discrete 5.1), defining M&E as Music and Effects and allowing other allocations; R 48-2005 gives older tape allocations such as case 2b (mix on 1-2, international sound on 3-4). Curator qualifications: Partially verified: the curator re-read S8, S9; S4 was not re-read by the curator and rests on the producer's pinned reading. Curator GET 2026-10-23 of the sources not re-read (mechanical source evidence, not semantic verification): S4: HTTP 200, bytes differ from the producer pin. Recommendations read 2026-10-22; no files exchanged or measured. AS-11 UK DPP citation (S4) not re-read; row contents beyond the codes not re-transcribed. Limitations: Recommendations read 2026-10-22; no files exchanged or measured. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://github.com/AMWA-TV/AS-11_UK_DPP_HD/blob/12e100a3de2f60592413a0d21f81f343505e0123/specification_text_views/AMWA_AS_11_UK_DPP_HD.simple.txt",
      "note": "EBU R 123 (2009) PDF, Table 1 and legend, section 2; EBU R 48-2005 PDF, Table 1a"
    },
    {
      "url": "https://tech.ebu.ch/docs/r/r123.pdf",
      "note": "EBU R 123 (2009) PDF, Table 1 and legend, section 2; EBU R 48-2005 PDF, Table 1a"
    },
    {
      "url": "https://tech.ebu.ch/docs/r/r048.pdf",
      "note": "EBU R 123 (2009) PDF, Table 1 and legend, section 2; EBU R 48-2005 PDF, Table 1a"
    }
  ]
}