currently watched channel vs. currently watching channel

[yunakim]

I'm confused about usage of past participles.

Here is example sentences.
He will watch the adjacent TV channels of currently watched channel.
=> intended meaning: He will watch the adjacent TV channels of the channel that he is watching now

which is right ? currently watched channel or currently watching channel.

There's one more thing.

He chose the up channel of previously watched channel.
=> intended meaning: He chose the up channel of the channel that he watched right before

is the expression right?

[Soup]

Hi yunakim

channels currently watched = currently watched channels.

Currently watched channels are 'the channel that he watched right before.'

I have a question, yunakim, what does up channel mean?

[yunakim]

sorry for my imprecise expression.

Ch 7 is 'up channel' of channel Ch 6, likewise ch 13 is of Ch 12...