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pro audio questions
 

offline magicant from Canada on 2009-02-21 14:58 [#02274118]
Points: 2465 Status: Lurker



i was looking for a thread about general questions about
pro audio but couldn't find one, so let this be it...

i've recorded some tracks of myself playing the piano and
singing, but my main complaint is that it's too QUIET.
people have turn up their speakers at maximum to hear it at
normal. is there an audio editing program where i can raise
the gain -- or maybe i can record it louder somehow? i'm
using an m-audio interface, fasttrack pro, with one
condenser mike for my piano, and one dynamic mike for the
vocals. i'm recording them at once to get a genuine acoustic
feel.

this is the only question i have, but if you're interested
to know what exactly i'm recording, i put them on a website,
www.peterholm.ca but i don't mean to spam, this is a tech
question


 

offline fleetmouse from Horny for Truth on 2009-02-21 15:02 [#02274120]
Points: 18042 Status: Lurker



You can "normalize" your tracks in sound forge or audacity
or wavosaur (last two are free). That will bring up the
loudest part of the song as loud as it can go, and bring up
the quieter parts but keep the relative levels between soft
and loud the same.

The downside is this will also make any background hiss or
hum louder too. You might end up wanting to re-record at a
higher volume.

You can also use a compressor / limiter to even out the
volume levels, but that can destroy dynamics so you have to
be careful.


 

offline fleetmouse from Horny for Truth on 2009-02-21 15:04 [#02274121]
Points: 18042 Status: Lurker



Also check the m-audio docs and forums to see if you can
activate an onboard preamp to get a better volume level.


 

offline Uelogy from Enruo (Saint Vincent And The Grenadines) on 2009-02-21 16:59 [#02274129]
Points: 90 Status: Lurker



its very tricky to make a shit recording sound good - its a
lot eaisier to make a good recording sound great.

try eq'ing and comping, noise reduction (normally would stay
away from it) works really well sometimes - i used to use it
alot when i was starting out and had a really loud
noise-floor on my first system.

Focus on the input quality before recording save alot of
headache.


 

offline dave_g from United Kingdom on 2009-02-21 17:15 [#02274130]
Points: 3372 Status: Lurker



You could normalise the signal, but as fleetmouse said, it
will amplify the noise as well.

You really want to get the best signal to noise ratio that
you can. There are a few ways to do this:
passive: move the mic closer to the sound source.
active: use a low noise mic preamp to amplify the signal
from the mic.
DSP: noise reduction using a software program.

Passive is best, since it adds no additional noise.

Active is next best. It will add noise, since there is no
such thing as a noise free amplifer (except in textbooks!).
A good low noise preamp will hardly add any additional noise
and can really boost up your volume.

DSP is 3rd best. Different algorithms can do all sorts of
weird things. It depends on the algorithm used and how
representative your predefined "noise" sample is.

The other thing to ensure is that you are using "balanced"
audio cables. These will have two audio signals, where one
is the inverse of the other. Noise is picked up equally by
both signals, but is cancelled when one of the signals is
inverted in the mixer to make them both the same polarity.
If you have "unbalanced" cables, any noise picked up by the
cable cannot be cancelled this way (cable only carries 1
signal).

Hopefully your microphone and soundcard support balanced
cables.

Once you have a high signal to noise ratio, you can use a
wave editor to normalise the levels and the noise will not
become a problem.

If you have mains "hum" problems, this can be easily removed
using digital filters on a wave editor or you can use
ferrite and things on cables. Providing the mains hum isn't
hitting FSD on your DAC, just zap it with some very narrow
bandwidth filters in software, say at 50,100,150Hz (or
60,120,180Hz for you septics).

Don't bother with compressors/limiters. All you need is
amplification. Ideally amplify it in the analogue domain (ie
before the soundcard) to reduce quantisation errors if you
have to normalise.

free:audacity and normalise,
money:buy low noise mic pre amp.

Hope that m


 

offline dave_g from United Kingdom on 2009-02-21 17:19 [#02274131]
Points: 3372 Status: Lurker | Followup to dave_g: #02274130



fscking zilty character counter strikes again!

All I wanted to say was "hope that makes sense"

Even checked it in the preview :(

BTW, I really agree with Uelogy's great advice:
"its very tricky to make a shit recording sound good - its
a
lot eaisier to make a good recording sound great. "



 


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