I also (frequently) ASK myself that “torturous” … QUESTION…?
The one – I answered for myself – (in mid 1965).
And still – after “over” 45 years…
IT – is STILL my favourite question…
How many channels are there ?
In ANY “one” (RAW) two_channel STEREO Audio Recording
At first – this “appeared” to be JUST three… (3)
Until I “found” MORE.
Soon it was six, quickly followed by seven – then came NINE & TEN …
(see this video of mine …)
AND THEN?
Thirteen “channels” …came (& went) – just as quickly – as did twenty five (YES_ 25)?
& Still –
I asked myself the question?
HOW MANY ARE THERE…?
I finally GOT my answer – ?
by simply “SITTING DOWN” for a very long time & doing the sums…
ANSWER…
64.77+ Million “separate” audio channels.
There are OVER “sixty four” MILLION “separate” analogue audio channels…
Yes- DEEP INSIDE (& thus “in”) ANY_RAW “STEREO” –
(& Thus- so too- inside Ur 2ch i-Pod’s)
Or….
???
Here’s a (really, really “good”) Q.? U’ll be asking of youself 
AFTER clicking on the video “linked” (to & through) this picture.
I just answered this Featured Question; you can answer it too!
All shall be revealed – ONE video at a time…Via my “channel” – over on Youtube (either go to Youtube & search – User QUIX4U)Or… click this link through – to open THESE (my) VIDZ – in a new window?QUIX4U (YouTube) = TRIPELLO (Xanga) = QUIX (NZ) = 3-in-1 (ME- “at_home’) Cheers & have FUN always…KEITH.