Hey Mark,

RIAA - the original RIAA curve is the one, forget the variants, especially the IEC variety. 
It's a high-frequency pre-emphasis filter that overcomes the inherent surface noise of vinyl by boosting the HF, and reducing the. bass so that the needle doesn't jump out of the groove. 
Also, the curve you most commonly see is the reproduction (de-emphasis) curve (the one which slopes downwards) - this is irrelevant, since anything you play the vinyl back on will have this frequency response built-in. The recording curve is the one which matters -  I think it should not be too hard to implement the original equation in C, or even using exp~ or fexp~ - just to send it to the lathe.

The problem is that the mechanical nature of vinyl means that, a standard 6dB/octave single-pole highpass filter won't work, because the amplification needed to restore the bass would be too great. It's a sort of "kinked" highpass filter. See this article: http://www.stereophile.com/features/cut_and_thrust_riaa_lp_equalization

Also, the mix must be mono compatible. This mostly means keeping bass frequencies in-phase and trying to make everything below about 220Hz mono.

Metastudio 4. I call that a "lost" metastudio, because I variously did and didn't distribute (leak) it on a personal basis (I was slack/busy, I had kids, you know...)

Metastudio 5 on the other hand, is currently being worked on. New synthesis units based on analogue wavefolding techniques, the tracker sequencer with cut and paste, and the quadtracker - a monster 4-channel tracker style sequencer. I need to write a whole load of help files this time also, and some more explicative performance patches...early 2013

Cheers,
Ed
 
Gemnotes-0.2: Live music notation for Pure Data, now with dynamics!
http://sharktracks.co.uk/

From: me.grimm <megrimm@gmail.com>
To: Ed Kelly <morph_2016@yahoo.co.uk>
Cc: "pd-list@iem.at" <pd-list@iem.at>
Sent: Friday, 21 December 2012, 14:40
Subject: Re: [PD] mastering to vinyl live w/ pd

hey all thanks for the tips!

nicolas: your phasemeter looks great. i will use that.

but what is a riaa filter then? is there an implementation in pd? from eds link it looks like there is two such curves. one original RIAA curve and the other as RIAA/IEC curve.

btw nicolas your website looks super great and slick. im curious on the topography record you made. any for sale? sound samples?

ed: thanks for reminding me of your metastudio project. i just revisited and remembered all the nice stuff you had going on. were not you promoting a version 4 at one point? what happened to that?

hopefully ill get something cutting over break before the next semester starts!

m

On Thu, Dec 20, 2012 at 6:57 AM, Ed Kelly <morph_2016@yahoo.co.uk> wrote:
These are some abstractions I have made that do some of what you are asking...the compressor~ is vanilla.
Mastering is primarily about developing "golden ears" but you also need to take into account the RIAA curve: http://www.tanker.se/lidstrom/riaa.htm

Remember it's mechanical - I understand that once the RIAA is taken into account, the most pressing issue is bass - extreme bass and the needle jumps, too much and the track is too wide so you get less time. If it's set up wrong then tracks will overlap (but there could be some interesting "jumping record" experiments in there. 

Best,
Ed
 
Gemnotes-0.2: Live music notation for Pure Data, now with dynamics!
http://sharktracks.co.uk/



----- Original Message -----
> From: Lorenzo Sutton <lorenzofsutton@gmail.com>
> To: pd-list@iem.at
> Cc:
> Sent: Wednesday, 19 December 2012, 21:23
> Subject: Re: [PD] mastering to vinyl live w/ pd
>
>
>
> On 19/12/12 03:10, me.grimm wrote:
>>  does anyone know much about mastering? i dont.....
>>
>>  anyway i have this record recorder/cutter/lathe and was thinking of
>>  doing something like this:
>>
>>  http://www.youtube.com/watch?v=TDnpXVUKXM0
>
> Very interesting--- thanks for sharing, I couldn't resist noting (and
> continuously concentrating) on the ground loop (maybe empathised by the
> woofer..) I'm not totally sure that was intended though ..
>>
>>  which is funny because i have a similar recorder. although i was
>>  thinking just cutting in real-time straight from PD. but to get the best
>>  sound maybe i could run it through some kind of "mastering"
> patch. has
>>  anyone made such a thing or know best to do in terms of getting decent
>>  masters right from PD? I would think something like:
>
> Emulating it as well? I know you lose all the materic thing, but it
> could be fun.
>
> The voice as heard in the video has something fascinating, it would be
> interesting to find out what modern digital audio compressions (data
> such as mp3, ogg etc. can create similar suggetions...)
>
> Lorenzo.
>>
>>  [equilizer~] - but what one? [adaptive/nlms3~]? adaptive_equilization
>>  example which im not sure i would know how to use for this
>>  |
>>  [unauthorized/compressor~] - although there is prob a good vanilla one no?
>>  |
>>  [expander~] ???
>>  |
>>  [exciter~]
>>  |
>>  [zexy/limiter~]
>>  |
>>  [hip~ 40]
>>  |
>>  [lop~ 16000]
>>  |
>>  [dac~]
>>
>>
>>  but i might just make a mess with this....
>>
>>  m
>>
>>
>>  _______________________________________________
>>  Pd-list@iem.at mailing list
>>  UNSUBSCRIBE and account-management ->
> http://lists.puredata.info/listinfo/pd-list
>>
>
>
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--
____________________
m.e.grimm | m.f.a | ed.m.
megrimm@gmail.com
_________________________________