On Sun, 2009-03-15 at 21:53 -0500, David Miller wrote: > Well I have used Audacity for 3-10 min recordings in the past but not > for hour long recordings. I have. It worked as well as short recordings. Of course, to edit it, you need to have enough RAM to fit the whole thing in, or it's going to be painful to work on. > I put this machine together and loaded FC10 Sat. and verified that > sound worked, didn't have time to do much testing. Took the machine > to the church this morning and did the recording. I was disappointed > with the results this first week. There was a high pitched hiss > throughout the recording. I don't know what to make of it yet. I am > taking the sound directly from our 32 channel audio mixer. Not the > right sound for a ground loop. You can still get them with that. Considering the complications of connecting different equipment together, and the additional problems a computer might add, I err towards using audio transformer coupling between mixers and the computer. That eliminates the possibility of ground loops, and makes it harder for other instabilities to introduce noises. Getting a simple transformer DI box with attenuator pad switching to place between mixer and computer might be a simple solution. Hiss could be from any number of sources. If it's like the typical amateur set-up, people are often using the equipment wrong (e.g. they turn down the input gain and turn up the output gain, amplifying a lot of noise as well as the wanted signal). Remember that mixer level controls are not at the immediate input and outputs of a desk, there are amplifiers before and after each of them. And, like you said, depending on your tape system, it may be masking it by lack of ability to record it. I'd be going in and experimenting at a time that you can do so without interrupting services. Take a very good pair of headphones with you, and a tame victim to speak into microphones while you try things out. You should take a line out signal from the desk to a line input on your sound card. You may well need to attenuate the signal between the desk and the computer. Depending on your sound card, it's probably optimal if you get normal signal levels when the sound cards audio mixer controls are around 50 to 75% of the way up. If they're set elsewhere, you probably need to change the signal level being fed to the computer. Make sure that you turn off the other input channels on the computer mixer (microphone, CD, etc.), unhide other channels from the mixer control GUI so you can check they're turned down. And do the same on the real audio mixer (turn the unused channels down, set up input gain controls so the input and output channel fader levels are around the 75% mark). If your mixer has a spare output channel, and you have auxiliary sends on the input channels, consider running the recorder completely separate from how you drive a PA system. The two have different mixing needs. Sound reinforcement (PA) is adding amplified sound to natural sound. Recording has only the microphone signals, and doesn't have the additional natural sound to add to the level. It may be best to record from signals before the tone controls, if you're radically changing the tone controls for the PA side of mixing. But, despite your best efforts, you could be hamstrung by having a rotten sound card in your computer. Many of them have awful input stages. These days, mobile DJs that use computers instead of discs, will often use an off-board USB sound card to avoid some of the noise issues they get from internal sound cards. -- [tim@localhost ~]$ uname -r 2.6.27.19-78.2.30.fc9.i686 Don't send private replies to my address, the mailbox is ignored. I read messages from the public lists. -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
