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Reamping via guitar pedal
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dialectic
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#1
5th July 2010
Old 5th July 2010
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Reamping via guitar pedal

I have read that when reamping a guitar/bass that it is possible to use a guitar FX pedal in 'bypass' mode to provide the correct impedance and level for the amp. Could someone please confirm or debunk this for me please.
#2
6th July 2010
Old 6th July 2010
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Not sure about that, I use a guitar, cable straight into a 512c pre+ convertor.
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#3
6th July 2010
Old 6th July 2010
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interesting thought,

i would think it would only apply if it was not a true bypass pedal,

but then you might also have a negative impact from the input of the pedal seeing the wrong impedence...

but i'm not an EE

so i am also interested in a more informed opinion on this...
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6th July 2010
Old 6th July 2010
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Impedance is not the real issue here - level is the real issue.

Certainly - impedance loading on your guitar's passive pups has a big affect on your tone. But - that effect is locked into your clean DI track, and it's too late at the actual re-amping stage. I'll assume you have recorded your clean DI mono track with a decent DI box or instrument level preamp.

The trick is to match the output of your D/A converter to your amp. Pro D/A output is +4 balanced - waay too hot for a guitar amp. Even semi-pro -10 unbalanced output is too hot. Sure - you can connect them up with a cable, or even with a roughly unity-gain stomp box, but if you don't have sufficient attenuation, you could end up attenuating in the digital domain. The downside of doing that is that your D/A has a fixed level of hiss/hum/grunge. By dropping your DAW faders to match levels, you aren't dropping this fixed level of noise. So your signal to noise ratio suffers - and that isn't a good thing when you are going to drive a high gain amp.

It's much better to attenuate in the analog domain, after the D/A, which reduces the noise too.

The other problem is that direct audio cables between DAW and amps etc can bring ground loop hum to the party.

I prefer a decent passive reamp box - which is totally different to a passive DI used backwards.

A passive DI (transformer) is designed to attenuate an instrument down to Mic level. So used backwards, it provides a voltage multiplication (at the expense of current reduction). Using one backwards is really dumb - because the last thing you need when trying to hook up your line level signal to a guitar amp is MORE level ...

A real reamp box is a custom designed box for a specific purpose, and nothing does it better. Sure - plenty of methods will pass signal. And noise.
dialectic
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8th July 2010
Old 8th July 2010
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Thanks for the posts guys!

Kiwi, your reply was most informative and has helped clarify the possible issues or re-amping without using a dedicated device.

So in a nut shell, if a dedicated reamping device is not available it is possible to re-amp using a guitar pedal (as long as its not true bypass) but with the risk of noise being introduced to the signal?
Vogon
#6
9th July 2010
Old 9th July 2010
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Quote:
Originally Posted by dialectic View Post
So in a nut shell, if a dedicated reamping device is not available it is possible to re-amp using a guitar pedal (as long as its not true bypass) but with the risk of noise being introduced to the signal?
Yes. A pedal which buffers the signal in bypass (ie. Boss) will work. Watch out for some distortion pedals as they can have effect bleed in the output in bypass (AFAIK Ibz/maxon TS9 etc.).
But I believe some non-true-bypass pedals do not buffer.
As stated, you just have to drop the gain coming from the dac.
dialectic
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10th July 2010
Old 10th July 2010
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Thanks for the replys thumbsup
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