Synth-DIY Yahoo! Groups Archives

Thread

record quality sound - midi clock issue in command station?

2010-09-14 by mariusz_ot

Hi!
I've been happily using e-mu romplers for few years now, together with Presonus Firebox and Ableton Live. I recently bought a digital cable to hook my Px-7 and record better quality sound.

The problem is the sound I hear in Win XP (even from foobar, etc.) is clearly slowed down by few cents like in a turntable record:/ No matter the sample rate in Presonus setup. I have my PX-7 connected to my Presonus Firebox via Spdif cable to send digital audio in. Although MIDI Clock in command station is turned off, my pc behaves like a slave.
There's no such problem if I connect it to analog (noisy) inputs, even with midi cables connected and working without a glitch! Unfortunately I can't test my Firebox with other spdif connection now.
Any guesses?

Elektrofunkenstein

Re: [xl7] record quality sound - midi clock issue in command station?

2010-09-14 by Jack Pratt

I would guess that the data rate of the firebox is different to the sample rate 
of the digital data from the PX7. The rate of the data is not so important (as 
long as you transfer enough of it to prevent gaps) but the digital signal needs 
to be converted back to analogue at the appropriate rate.

The sample rate of the firebox would be the rate that it converts analogue to 
digital not necessarily the expected digital data rate.

Since the sound is only slightly slowed down, I would guess that something in 
your system is running at 44kHz rather than the 44.1kHz of the proteus 2k. This 
would be the play back rate of either the firebox driver or the audio codec 
being used to play the sound on your computer.




________________________________
From: mariusz_ot <elektrofunkenstein@...>
To: xl7@yahoogroups.com
Sent: Tue, September 14, 2010 10:47:18 PM
Subject: [xl7] record quality sound - midi clock issue in command station?

   
Hi! 
I've been happily using e-mu romplers for few years now, together with Presonus 
Firebox and Ableton Live. I recently bought a digital cable to hook my Px-7 and 
record better quality sound. 


The problem is the sound I hear in Win XP (even from foobar, etc.) is clearly 
slowed down by few cents like in a turntable record:/ No matter the sample rate 
in Presonus setup. I have my PX-7 connected to my Presonus Firebox via Spdif  
cable to send digital audio in. Although MIDI Clock in command station is turned 
off, my pc behaves like a slave.
There's no such problem if I connect it to analog (noisy) inputs, even with midi 
cables connected and working without a glitch! Unfortunately I can't test my 
Firebox with other spdif connection now.
Any guesses?

Elektrofunkenstein

Re: [xl7] record quality sound - midi clock issue in command station?

2010-09-16 by Elektrofunkenstein

Your guess wa right! Howver it was 48kHz in my system that was changed to 44kHz by CS. I used 48khz for Premiere and switched it back to 44kHz but I wasn't aware the fact that Presonus driver for some reasons kept switching it back. Thanks for saving time. I would still probably focus on midi clock to find the solution.
Cheers!

On 14 September 2010 22:55, Jack Pratt <woodsworth1@...> wrote:

I would guess that the data rate of the firebox is different to the sample rate of the digital data from the PX7. The rate of the data is not so important (as long as you transfer enough of it to prevent gaps) but the digital signal needs to be converted back to analogue at the appropriate rate.

The sample rate of the firebox would be the rate that it converts analogue to digital not necessarily the expected digital data rate.

Since the sound is only slightly slowed down, I would guess that something in your system is running at 44kHz rather than the 44.1kHz of the proteus 2k. This would be the play back rate of either the firebox driver or the audio codec being used to play the sound on your computer.

From: mariusz_ot <elektrofunkenstein@...>
To: xl7@yahoogroups.com
Sent: Tue, September 14, 2010 10:47:18 PM
Subject: [xl7] record quality sound - midi clock issue in command station?

Hi!
I've been happily using e-mu romplers for few years now, together with Presonus Firebox and Ableton Live. I recently bought a digital cable to hook my Px-7 and record better quality sound.

The problem is the sound I hear in Win XP (even from foobar, etc.) is clearly slowed down by few cents like in a turntable record:/ No matter the sample rate in Presonus setup. I have my PX-7 connected to my Presonus Firebox via Spdif cable to send digital audio in. Although MIDI Clock in command station is turned off, my pc behaves like a slave.
There's no such problem if I connect it to analog (noisy) inputs, even with midi cables connected and working without a glitch! Unfortunately I can't test my Firebox with other spdif connection now.
Any guesses?

Elektrofunkenstein