New recording idea, a bit crazy

[nslhrn]

I think this would be agreat options also.
I envision being able to use the Samson USB mic  or the Snownall from Blue.
And then also to have the option to use some sort of direct box to the line-in.

Or how about having it some that I can record two mono sources simultaneously so that I can sing lead a partner plays  bass. Then I can go back and add back ground vocals. 2 or three.

Im sure this could be accomplished with some sort of mixer before outputing to the iRiver, I'm just imagine plugging a usb mic into the iRiver and another mic into the input Or have the software read the stereo mic as to differnet tracks. So that if iRiver can play 4 tracks two would be used in a single pass but kept as different 'takes'

This would make a nice pocket composer's studio for capturing ideas and creating all the harmony to support the idea. I find I often sing some things but when I listen back, I can't rememeber the additional parts I was thinking of. Multi-track would allow me to capture the other parts I hear and preserve my ideas.

Cool idea. Hope it works out.

[gitarald]

This is just to let you all know that there's another one out there dreaming of this possibility to use his iriver as a mobile multitracker studio ... 

Harry

[969696]

Hi ! I bought a h120 to record my flute playing. Being able to record over a drum or a bass track would be great.

Another dreamer.

[zenx]

is this possible at all? opinions?

[NK-A]

As you can read on this forum some people think it could actually be possible. However noone smart enough (and motivated enough and so on...) have had the time to do something about this. Or so it seems anyway. I guess it takes a lot of work and is not the highest priority. So we normal dummies that don't know how to do it just have to wait and see if something happens. I would love to see this feature in rockbox, but that just isn't enogh to make things happen...

[petur]

full duplex sound is not the problem as in one of my experiments I have managed to record the voice output (this was before the encoder framework and before running recording unboosted however)

The problem lies more in the fact that, the way rockbox works now, you're either playing or recording as the buffer is shared.

[cpartiot]

good idea ! is somebody able to do that ?
very interesting for band recording !!!

[jhMikeS]

Just write the plugin. The apis are present in the plugin api. Mixing channels is not CPU intensive at all (voice is mixed live with playback). preglow and I have already implemented effects with low latency (flanger with feedback and ring mod respectively) and some other revisions I discussed in IRC with amiconn can lower the latency to near 0. Those changes should be very straigtforward and the core recording will use them too.

[mlind]

...preglow and I have already implemented effects with low latency (flanger with feedback and ring mod respectively)...

You didn't also happen to put some of these ideas into code:
http://forums.rockbox.org/index.php?topic=2307.0
??

[Multiplex]

... preglow and I have already implemented effects with low latency (flanger with feedback and ring mod respectively)

Are your effects, or a skeleton, available as source to act as seeds for neebs like me who find the idea of starting from scratch too daunting ?

(I've tried playing a bit with pitch changing on a PC but I only have Delphi as an IDE and all the interesting algorithms I've found are C or C++)

Edit: some sober thought made me realise that all the Rockbox DSP stuff is Fixed point and the PC algorithms make use of Floating Point and even Trig functions ... it will be a lot more work than I imagined ... still worth playing with ;-)

[halmi]

Hello ROCKbox-Community,
please excuse my probably bad english. I'm an Austrian student and I'll do my best.

I know that the last post in this thread is nearly a year old, but there have been some other posts (eg. here) about that topic and I want to ask if some kind of development is going on in this direction.

For me it would be enough if I could listen to one file while recording to another one.

Then it would be cool to have a plugin which can mix multiple tracks and export that as a new audio file. Of course this needn't be in realtime. So you can mix that tracks together that you want to hear via headphones while you are recording. If that mixer has some more options it would also be suitable to create a final mix, but maybe that goes a bit too far...

If it is possible to code just the listening-while-recording thing, that would be a great step.

As far as understand there is also a Feature Request in the tracker, which requests the same thing, but it did'n get much attention till now.
http://www.rockbox.org/tracker/task/6723

[jhMikeS]

What do you expect out of these devices? They really aren't engineered for this sort of use. I'm against introducing any such functionality in the core but anything the core recording uses (the very same API in fact) is available to a plugin intended to do exotic things.

Some have said they can't get recording to function in a plugin so I simply recommend they imitate pcm_record.c to the letter - no shortcuts because they assume some function call isn't nescessary - they all are. Use the API as intended and it will work. It is verified to work.

EDIT - I'll mention here too that full-duplex sound on ColdFire based devices is also verified to work. I've handed out the effects plugins (simple proofs of concept) source codes to those who have asked on several occasions.