Support and General Use > Recording

is it possible to play with yourself?

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benosoft:
Hey jhMikeS, I knew about full duplex, but I didn't know there actually were effects plugins!
Do you have any interesting links about them?

Thanks!

jhMikeS:
benosoft,

Sorry, no links. They were just a couple experimental bits preglow and I made up to prove things out - flanger and ring mod.

Multiplex:

--- Quote ---You are listening to the data received from the ADC being looped back to the DAC.
--- End quote ---
I understand what you are saying is true in the context of the effects stuff but what I think quicy is after is playing a file - a backing track say, and adding another track to it (vocals) and record the resultant mix.
This can be done in two ways;
A) play a file to line out, mix in the new track(in the analogue domain), record the original + new to a new file
B) play a file, get line in (assume it is only the new track) and mix it into the original file (or maybe the input will be written to a second file to be mixed off-line)

I suppose that they are roughly equivalent to the old two deck and single deck tape recording methods. To cary the analogy further in B you have the delays caused the the pipelines in the DAC and ADC, the same as the distance between the record/playback heads on the tape players. On the tape players they eliminated this problem by using the record head to play the backing track while recording the new track.

I suspect the pipelines are tiny (single sample each maybe - you'll know from the effects stuff) but any leakage of the backing track into the recording stream will cause it to be mixed in a few samples out of phase - effectively creating a filter.

Option A of course suffers none of the synchronisation problems but does have multiple D-A/A-D stages so there will be increasing levels of qualitisation noise.

Just the ramblings of an intrigued lurker ...

jhMikeS:
There's possiblity in that but I don't really think it's a core feature but is quite able to  be implemented in a plugin. The same pcm functionality that the core uses is available to plugins for recording and playback. IIRC this entire subject has come up previously.

There is 12-24 samples hardware delay for a full loop depending on the CPU. Of course this and buffer delay can be compensated by moving the mix point back in time to the proper buffer location.

I think one of the effects I mentioned counts as a comb filter made by the analogue technique of mixing the delayed signal with itself via recorder delay and changing tape speed with a finger on the flange. The other doesn't have anything to do with jewelry modification. :D

EDIT: Just noticed there's another thread about this in this forum. Three times the charm. :P

mlind:
EDIT: Right. Moved.

http://forums.rockbox.org/index.php?topic=8144.msg91295#msg91295

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