Implement Forward/Backward for Seq

[duysqubix]

Hi folks,
I have a list of streams wrapped by beep.Seq(). These are all played sequential one by one.
How do I get it managed to jump forward and backward in the streams.

Let's assume this:
Seq: Stream 1 -> Stream 2 -> Stream 3 -> Stream 4

When the player is started and is in stream 2 after a while, I want to jump to stream 3.
From there I want to jump back to stream 1.

How do I achieve that? I know, I could rebuild the sequence (beep.Seq()), but is there another way?
Or isn't it possible, because I missed something...

Thx

Original issue: faiface/beep#156

[MarkKremer]

Idea: a Playlist streamer which is like Seq but stores the streamers and allows swapping in/out tracks and seeking.

I'm thinking about other possibilities still.