Use actual footnote, add hyperlinks to packets.

doc/modules/ROOT/pages/touch_audio.adoc

@@ -1,4 +1,4 @@
-= Touch Audio 
+= Touch Audio
 David Ng <nudge@nudge.id.au>
 :stem: latexmath
 
@@ -15,10 +15,11 @@ handled.
 [[touch-cue-preview-protocol]]
 == Touch Cue/Preview Protocol
 
-After startup, the mixer continuously sends timing packets (`20`) to each
-supported player every 7ms. In order for a player to receive timing
-packets, bit 5 of byte `cd` of the <<vcdj#cdj-status-packet,CDJ status
-packet>> (type `0a`, port 50002) must be set.
+After startup, the mixer continuously sends <<audio-timing,timing
+packets>> (`20`) to each supported player every 7ms. In order for a
+player to receive timing packets, bit 5 of byte `cd` of the
+<<vcdj#cdj-status-packet,CDJ status packet>> (type `0a`, port 50002)
+must be set.
 
 The timing packets contain a flag _E_ which indicates that the "Link Cue"
 button on the mixer is on or off.
@@ -32,37 +33,40 @@ disengaged"_ means that the DJ stops scrubbing on a waveform.
 
 When touch audio is engaged on a player (the initiator player):
 
-* The initiator player sends a zero-filled audio packet (`1e`) to the
-  mixer.
+* The initiator player sends a zero-filled <<audio-data,audio
+  packet>> (`1e`) to the mixer.
 
 * If the initiator player is currently not elected, the mixer sends a
-  handover packet (`1f`) to the initiator player. The next timing packet
-  will set T to the player number that initiated touch audio. If the
-  player is already the elected player, this step is skipped.
+  <<audio-handover,handover packet>> (`1f`) to the initiator player.
+  The next <<audio-timing,timing packet>> will set T to the player
+  number that initiated touch audio. If the player is already the
+  elected player, this step is skipped.
 
-* If E is `00` and touch audio is engaged:
+* If _E_ is `00` and touch audio is engaged:
 
-** The elected player sends zero-filled ^[1]^ audio packets (`1e`) to the
-   mixer for every second timing packet received.
+** The elected player sends zero-filledfootnote:[If touch audio is
+engaged but _E_ is toggled from `01` to `00`, instead of the player
+sending zero-filled <<audio-data,audio packets>> (`1e`), the player
+will repeatedly send the last frame of audio data previously sent to
+the mixer when E was `01`.] <<audio-data,audio packets>> (`1e`) to the
+mixer for every second <audio-timing,timing packet>> received.
 
-* If E is `01` and touch audio is engaged:
+* If _E_ is `01` and touch audio is engaged:
 
-** The elected player sends audio packets (`1e`) to mixer with uncompressed
-   PCM signed 16-bit, little endian, 48000Hz, stereo data for every timing
-   packet received.
+** The elected player sends <<audio-data,audio packets>> (`1e`) to
+   mixer with uncompressed PCM signed 16-bit, little endian, 48000Hz,
+   stereo data for every <<audio-timing,timing packet>> received.
 
 ** If touch audio is disengaged, the elected player continues to send
-   zero-filled audio packets for every timing packet received.
-
-* The elected player stops sending audio packets (`1e`) to the mixer when
-  both E is `00` and touch audio is disengaged OR the timing packet (`20`)
-  specifies that another player has taken over. The mixer continues to send
-  timing packets with T set as the last elected player.
-
-^[1]^ If touch audio is engaged but E is toggled from `01` to `00`, instead
-of the player sending zero-filled audio packets (`1e`), the player will
-repeatedly send the last frame of audio data previously sent to the mixer
-when E was `01`.
+   zero-filled <<audio-data,audio packets>> for every
+   <<audio-timing,timing packet>> received.
+
+* The elected player stops sending <<audio-data,audio packets>> (`1e`)
+  to the mixer when both _E_ is `00` and touch audio is disengaged OR
+  the <<audio-timing,timing packet>> (`20`) specifies that another
+  player has taken over. The mixer continues to send timing packets
+  with T set as the last elected player.
+
 
 [[audio-timing]]
 == Audio Timing Packets
@@ -166,4 +170,4 @@ include::example$status_shared.edn[]
 (draw-related-boxes (repeat 2 0))
 ----
 
-_D_ indicates the number of the mixer sending the packet.
+_D_ indicates the number of the mixer sending the packet.