Put the container on the chip, and find the held bus costs 463 times the seam

ROADMAP P6c, FINDINGS 68. 78,125 B of a DLXP2's audio out of channel 3,
sample-exact, while the video channel fetches records off the same disc.

The two pieces 67.6 said were missing: the lump buffer (pg_afill/pg_afetch,
three slots and the minimum is unmeasured) and 67.2's remainder accumulator
(pg_apay). The capture prices what the accumulator avoided at 1.26 s of
lip-sync over the game, against 67.2's predicted 1.25.

The finding is the third piece, which nothing had named: the MSM6258 has no
starvation state, so the gap between a channel counting out and the next arm
is a held nibble pair driving the predictor. Stealing, the seam is 0.51 ms
over ten seconds because dma.i's new DM_HOOK services the chip from inside
the transfer wait -- 250,000 of 250,240 looks. Held, the 68000 is halted and
gets 369: every one of the ten lump boundaries has a seam, worst 72.8 ms,
2.31% of the audio. Identical bytes, different sound. 64.3 reaching the audio.

Two bugs, and no counter in the player could see either. Clearing DM_BARV does
not unchain a channel -- OCR bits 3-2 are what it obeys -- and the symptom is
POLL TIMEOUT on the lump and every record after it. And the refill ran one lump
ahead of its ring and overwrote the buffer the channel was reading: 11 of 11
armed, 11 fetched, no starve, and the sound wrong from 0.2 s in. Which is why
the gate is a WAV: verify_packed_audio.py walks the stream one delivered byte
at a time, because MAME's okim6258 resets the nibble select on every write and
a byte is two nibbles only 99.994% of the time.

check.sh ALL GREEN before (tmp/check_s36_start.log) and after
(tmp/check_s36_end.log), with the new stage.

Claude-Session: https://claude.ai/code/session_01194oWYW8DQXK1SZ2DnChW6

tools/bench/check.sh

@@ -741,12 +741,41 @@ if [ -f "$HOME/mame/roms/x68000.zip" ] || [ -d "$HOME/mame/roms/x68000" ]; then
   DLX_PK_GATE_ONLY=1 DLX_PK_NFR="$NF" bash tools/bench/packed_run.sh \
     tmp/packed_singe.dlxp > tmp/packed_gate_stage.log 2>&1 \
     || { cat tmp/packed_gate_stage.log; exit 1; }
-  grep -aE "^  (FLAG|array|chain|frame clock|late frames|WRITE WINDOW)|^OK " \
-    tmp/packed_gate_stage.log
+  # SPLIT AT RUN 5, because the audio run below is in the same log and its
+  # verifier emits OK lines too -- one grep over the whole file would print
+  # session 36's result under session 31's heading.
+  sed -n '1,/--- 5. THE AUDIO/p' tmp/packed_gate_stage.log | \
+    grep -aE "^  (FLAG|array|chain|frame clock|late frames|WRITE WINDOW)|^OK "
 else
   echo "  SKIPPED: no x68000 romset -- the player was not run"
 fi
 
+echo "--- session 36: THE CONTAINER'S OWN AUDIO, OUT OF THE CHIP (FINDINGS 68) ---"
+# ROADMAP P6c. Every piece of this existed before this stage did and none of it
+# was joined up: the container has carried the lumps since 67, the transport is
+# the IPL ROM's channel-3 configuration from 66, and what was missing was the
+# lump buffer and the remainder accumulator in a player. This is the run where
+# a byte of the container reaches the speaker.
+#
+# WHY THE GATE IS A WAV AND NOT A COUNTER. src/player/packed.s reports lumps
+# armed, lumps fetched, payload bytes and starves, and EVERY ONE OF THOSE CAN BE
+# RIGHT WHILE THE SOUND IS WRONG -- which is not hypothetical, it is the bug
+# this session shipped: the refill ran one lump too far ahead and overwrote the
+# buffer channel 3 was reading out of, and the player's account of it was
+# 11 of 11 armed, 11 fetched, 78,125 B, no starve. Nothing parses a packed
+# container (FINDINGS 67.4), so a wrong byte is not an error, it is a sound.
+# tools/bench/verify_packed_audio.py accounts for all 78,125 bytes against
+# MAME's own capture, one delivered byte at a time.
+#
+# The run is part of packed_run.sh's gate half, so DLX_PK_GATE_ONLY takes it.
+if [ -f tmp/packed_gate_stage.log ] && \
+   grep -aq -- "--- 5. THE AUDIO" tmp/packed_gate_stage.log; then
+  sed -n '/--- 5. THE AUDIO/,$p' tmp/packed_gate_stage.log | \
+    grep -aE "^(OK|FAIL) |^  AUDIO:|^ {5}(nibbles per|worst|payload|-> |the player)"
+else
+  echo "  SKIPPED: no x68000 romset, or the container is silent"
+fi
+
 echo "--- session 33: AUDIO -- the encoder, and what it does to the wire (FINDINGS 65) ---"
 # ROADMAP P6, everything in it except the bus half session 20 closed. The audio
 # is the SAME WINDOW as the frames -- 00223 from 539.4 s for 10 s -- because an