Re: [LAD] audio/midi app development

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To: <linux-audio-dev@...>
Date: Thursday, June 17, 2010 - 2:22 pm

On Thursday 17 June 2010, Ralf Mardorf wrote:

There are several boards about that will let you treat a stepper equipt
machine like they were servo's. But in either case, if the stepper misses a
step, game over. So one stays within the limits of what the stepper can do.
I would explain why steppers and high speeds are mutually exclusive, but
then I'd really be off topic.

>but would you use your MacOS,

I have one friend down in TX that is running his stepper mill with a TRS-80
Color Computer whose clock is .79mhz. He has been making steam engines with
it. Slowly, very slowly, using a Dremel for a spindle. For that, Dremels
area POS.

Midi's timing is fairly critical, but steppers are even fussier at higher
speeds where the torque falls off.

>I guess there are reasons for using external micro controllers when

A good question. I believe the wiki may have a list of hardware broken down
that way, but its nowhere near complete or definitive. My machine is driven
by an early athlon single core, running at 1.6Ghz. That is why the latency-
test was written, because we needed to be able to define if it was usable
before we carved up an expensive hunk of metal & wrecked the job.

One should also bear in mind that MIDI, was standardized when a 600 baud
circuit was _fast_, 30 years ago. And IMO, MIDI as a standard needs to be
replaced by something with a 16 bit word, and 10 megabit or more data rates.
We can do it, optically or electrically today and I see no real reason not
to be developing a new standard that reflects what the hardware today can
do. Some folks I hear are using ethernet in studio settings, but the cables
aren't durable enough for the way touring musicians tend to treat them. So
that isn't something the guy who has a gig once a week in a bar wants to put
up with.

Anyway, I don't see any real progress being made toward a new std way of
doing midi, one that reflects what todays hardware can do. Till that day,
we are stuck with playing a midi piano that sounds a wee bit like Floyd
Cramer with an overdose of speed. With midi, you simply cannot bring all 10
fingers of both hands down on the keyboard truly simultaneously like a good
human player can. With midi working perfectly, those 10 notes are going to
have at least a .003 second lag from first to last.

>I should shut my mouth and lurk too.

Me too.

--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If 7-11 is open 24 hours a day, 365 days a year, why are there locks on the
doors?
-- Why Why Why n�6
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Messages in current thread:
[LAD] audio/midi app development, James Morris, (Tue Jun 15, 3:27 pm)
Re: [LAD] audio/midi app development, Paul Davis, (Tue Jun 15, 3:56 pm)
Re: [LAD] audio/midi app development, Arnold Krille, (Wed Jun 16, 5:22 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Wed Jun 16, 5:46 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Wed Jun 16, 6:30 pm)
Re: [LAD] audio/midi app development, Paul Davis, (Wed Jun 16, 6:41 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Wed Jun 16, 7:48 pm)
Re: [LAD] audio/midi app development, hermann, (Wed Jun 16, 8:01 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Wed Jun 16, 8:13 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Wed Jun 16, 6:52 pm)
Re: [LAD] audio/midi app development, Patrick Shirkey, (Wed Jun 16, 8:05 pm)
Re: [LAD] audio/midi app development, Gene Heskett, (Wed Jun 16, 10:45 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Thu Jun 17, 6:07 am)
Re: [LAD] audio/midi app development, Gene Heskett, (Thu Jun 17, 2:22 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Thu Jun 17, 6:16 am)
Re: [LAD] audio/midi app development, Gene Heskett, (Thu Jun 17, 2:25 pm)
Re: [LAD] audio/midi app development, Philipp Überbacher, (Wed Jun 16, 10:56 pm)
Re: [LAD] audio/midi app development, Gene Heskett, (Wed Jun 16, 11:32 pm)
Re: [LAD] audio/midi app development, Philipp Überbacher, (Thu Jun 17, 7:42 am)
Re: [LAD] audio/midi app development, Gene Heskett, (Thu Jun 17, 2:37 pm)
Re: [LAD] audio/midi app development, Joshua Boyd, (Thu Jun 17, 2:50 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Thu Jun 17, 8:36 am)
Re: [LAD] audio/midi app development, James Morris, (Thu Jun 17, 9:14 am)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Thu Jun 17, 7:51 am)
Re: [LAD] audio/midi app development, Gene Heskett, (Thu Jun 17, 2:42 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Thu Jun 17, 7:59 am)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Thu Jun 17, 6:10 am)
Re: [LAD] audio/midi app development, Gene Heskett, (Wed Jun 16, 11:27 pm)
Re: [LAD] audio/midi app development, Harry Van Haaren, (Wed Jun 16, 11:32 pm)
Re: [LAD] audio/midi app development, Gene Heskett, (Wed Jun 16, 11:41 pm)
[LAD] audio/midi app development, Ralf Mardorf, (Wed Jun 16, 10:08 pm)
Re: [LAD] audio/midi app development, Gordon JC Pearce, (Thu Jun 17, 8:25 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Thu Jun 17, 8:44 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Wed Jun 16, 9:20 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Wed Jun 16, 9:27 pm)
Re: [LAD] audio/midi app development, Ralf Mardorf, (Wed Jun 16, 8:33 pm)
Re: [LAD] audio/midi app development, James Morris, (Tue Jun 15, 6:40 pm)
Re: [LAD] audio/midi app development, Tim E. Real, (Tue Jun 15, 9:54 pm)
Re: [LAD] audio/midi app development, Harry Van Haaren, (Tue Jun 15, 7:23 pm)
Re: [LAD] audio/midi app development, James Morris, (Fri Jun 18, 10:06 am)
Re: [LAD] audio/midi app development, James Morris, (Fri Jun 18, 10:12 am)
Re: [LAD] audio/midi app development, James Morris, (Tue Jun 15, 7:55 pm)
Re: [LAD] audio/midi app development, Harry Van Haaren, (Tue Jun 15, 8:24 pm)