matthere

Aha, I think I understand now. So the audio is going from the band out to the speakers without time manipulation? In that case, you would just monitor it normally.
As for syncing up, that requires you to know what the band is going to do, and choreograph beforehand. Example: Say you want to reframe when the key changes. Since your video is being slowed down, anything you film will be seen on screen at some point x seconds in the future. Therefore, you would have to reframe x seconds before the band shifts key.
I'm not sure what the purpose of chopping up the audio and playing back 1/4 of is anymore?

@IronFilm raises an important and fundamental issue - that if you're stretching time in any way you will get out of sync.  My method stayed in sync because it skipped past lots of content.
There is an element of time-stretching effect to what you're talking about, and there are algorithms that do such things, however fundamentally it means that the time it takes to listen to the output is different to the time it took to capture the input.
Have a think about how you're going to solve that and then we can talk about the details of implementing it  

It very much depends on what you're developing it on but I'm guessing in the context of what this will be used for that some artefacts would be acceptable to achieve the real time aspect of it?
 

Its doable with something custom written.
You record the incoming audio to files in increasing time chunks depending on the slow down percentage that you want, to take into account the time it will take to play them back.
So for example, lets take a half speed playback scenario.
The incoming audio (FILE 1) would be written to a file after the first 0.5 seconds and the playback of that file would begin immediately when its finished writing but at half speed.
Simultaneously, the still incoming audio would immediately start writing to a new file (FILE 2) which would need to be of sufficient length to cover the length of time the playback will take to complete the first file before it is ready to play this new file.
As our first file is 0.5 seconds, it will take 1 second to playback at half speed so our new file (FILE 2) will need to be 1 second long and this will immediately begin playing upon completion whereupon we begin recording another new file.
This file (FILE 2) will take 2 seconds to play back at half speed so our next file (FILE 3) will need to be 2 seconds long.
As this will take 4 seconds to complete playback at half speed our next file (FILE 4) will need to be 8 seconds long.
And so on and so on.
I've done you a spreadsheet illustration  

Depending on what you are going to run it on and how long the piece is you could do this in memory of course with buffers instead of writing to files.
The audio of course will be playing back at half pitch as well as half speed but there are enough affordable hardware solutions out there nowadays to take care of that.

Here's a thought - every second you take the first 1/5th of a second and slow it down to 20% speed and watch that for the full second, then at the start of the next second you skip forward the other 80% of the second to get to the start of the next second and the cycle starts again.
It would be semi-realtime, being that people would see and hear themselves in slow-motion with only a second delay.  
Considering you haven't specified what you're trying to accomplish, I'm not sure how this suits, but if you're looking at an art installation or something then that would work  

Yeah.
[email protected]

Talking of the Canon FD's I have just pulled the trigger on the Canon 20-35mm F3.5 which seems to match the other FD's well.
I have a set of Canon FD's which look great on the P4K. 

@Anaconda_ it's nice to use both actually, the extra speed from the booster can be really useful, and more reach with the glassless also has it's uses

Talking of the Canon FD's I have just pulled the trigger on the Canon 20-35mm F3.5 which seems to match the other FD's well.
I have a set of Canon FD's which look great on the P4K. 

No new camera. P4k update is firmware. Grant said it'll come in a couple weeks.

The era of Raw is around the corner, now that Nikon is implementing it others should follow
I know this has been said before but id rather more DR than pixels  

Yeah...

Either way. Doesn't seem much point arguing any further. xD

EDIT>>>
I had a longer reply but really I think "Fuck off" will suffice.
I'm joining the long list of people that have you on ignore you complete and utter tit.
 

Good to hear 4:3 anamorphic, 1.33x and 2x de-squeeze, and 2.39:1 modes coming in the 6.6 update in a month or two. Sux there isn't a 1.5x de-squeeze though.

Thanks for the positive feedback.
Much appreciated.
Please buy it
I've run out of gaffer tape making this one so that integration will have to wait for a while.
 

...which is a great way of discouraging anyone looking to actually build their skills. Not sure I like that idea. Without it i would make a serious foray into "best" video under $200. As it stands, lets just say I have @BTM_Pix beat on price. We'll see who wins on epoxying 😉

Amen.
Round and around this same tired conversation goes with folks wanting Canon dslrs to deliver what their C line does.
Maybe Canon should set up some kind of therapy group for those who still think it's 2008.

Some more information and pictures regarding the PBC in the NewsShooter feature here :
https://www.newsshooter.com/2019/06/22/cda-tek-pbc-pocket-bluetooth-controller-for-bmpcc-4k-ursa-mini-pro/

i'm excited its rained not heavy rain, but rain none the less. Which is wonderful seeing as most of western queensland is drought declared. So been undercover doing a few things. Heres a sneek peek of my youtube logo, got  alot of sanding and polishing to do but you get the idea and remember you saw it here first  😉. Those letters are 200mm high i did them big as a few of the smaller prototypes broke so i gave them some size to give em some strength. Their cut out of marble i had hoped to get some veining through the marble, some of that colour will come out when their polished i hope.
 
 

I think the Panny S1H might end up be the bargain of the year for all it could, and might have when it finally comes out. We could not of dreamed of a camera like this 3 years ago. I think you are underselling this camera by a huge amount. Sure I can't afford it, but if you can this thing is an industry game changer the way I see it.
This camera is going to become the new norm down the road. Panasonic has given us a gift with this announcement. Every company is going to have to pick up the pace big time to match it, let alone beat it. Not counting the CS from the S1 cameras is to die for.

Shot on GH5 and GH5S with the new lens. Looks really good to me.
This lens with ETC is a powerhouse.

Because it's full frame?
I'm in the camp that thinks full frame is overrated. I'm happy with my micro four thirds loser sensor (™Camera Conspiracies)! 

I actually have very similar feelings to yours. IMO their mistakes are:
- pricing 
- religious denial of PDAF 
- lenses size, pricing and general closness of L-mount standart (why the hack didn't they open it like MFT?) 
- no real breakthrough tech - built-ND, global shutter, 4k 120p, raw, etc
- no flip out screen on specific cine model?? 

Yeah cause Canon is for winners 😉

Isn't this going to be the camera Panasonic said in October they were going to  start producing?
"The Japanese electronics company revealed the organic sensor to the world in February this year, but has now announced that it will begin production on a camera system capable of shooting 8K video. Currently called the AK-SHB 810, it will be the world’s first camera to incorporate an organic sensor and, according to Panasonic, will be a compact, box-type, multipurpose camera" here Techradar.