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Post subject: True Bypass?
Posted: Thu Jan 01, 2009 10:33 am
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I was wondering what I have to do specifcally to find out whether or not my Big Muff Pi is true bypass. I read stuff online but I didn't understand some of the concepts like bypass mode. I don't really want to open it up, I just want to know what kind of test I need to do in order to find out if it's true bypass or not.


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Posted: Thu Jan 01, 2009 11:23 am
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other than listening to it, to hear if the effect is very quietly sitting underneath the signal (if it is the pedal isnt true bypass) its not true bypass. Also check the sound of the guitar straight into the amp. Compared to the guitar into the pedal but switched off into the amp. If it is true bypass the sounds will be the same. Usually pedals dull the sound by rounding the mids out a bit.

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Posted: Thu Jan 01, 2009 12:01 pm
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A quick and easy way to check for true bypass is this.
With your amp and pedal on, remove the power supply or battery from the effect. When the effect is off, you should still have output and can hear your guitar. It's easy if you use an AC adapter. I read this somewhere online and I tried it, the Boss pedals I have wouldn't let a signal through with out power. Every other pedal I tested (1 at a time) you could hear the signal.

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Posted: Thu Jan 01, 2009 12:17 pm
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ronbeeglejr wrote:
A quick and easy way to check for true bypass is this.
With your amp and pedal on, remove the power supply or battery from the effect. When the effect is off, you should still have output and can hear your guitar. It's easy if you use an AC adapter. I read this somewhere online and I tried it, the Boss pedals I have wouldn't let a signal through with out power. Every other pedal I tested (1 at a time) you could hear the signal.


I tried it and there was no sound :( . Looks like I'll need to get it moodded.


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Posted: Thu Jan 01, 2009 12:56 pm
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Did you make sure the pedal was off? Even a true bypass pedal will not pass the signal if you switch it on. By having the effect off your are essentially "bypassing" the FX circuit. Thus it's only traveling across the switch. Does that make sense? I thought the Big Muffs were true bypass, but I might have that confused with someother pedal.

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Posted: Thu Jan 01, 2009 1:09 pm
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ronbeeglejr wrote:
Did you make sure the pedal was off? Even a true bypass pedal will not pass the signal if you switch it on. By having the effect off your are essentially "bypassing" the FX circuit. Thus it's only traveling across the switch. Does that make sense? I thought the Big Muffs were true bypass, but I might have that confused with someother pedal.


Oh :!: well in that case it is true bypass :D . Thank You.


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Posted: Thu Jan 01, 2009 1:23 pm
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Blaqdog wrote:
ronbeeglejr wrote:
Did you make sure the pedal was off? Even a true bypass pedal will not pass the signal if you switch it on. By having the effect off your are essentially "bypassing" the FX circuit. Thus it's only traveling across the switch. Does that make sense? I thought the Big Muffs were true bypass, but I might have that confused with someother pedal.


Oh :!: well in that case it is true bypass :D . Thank You.


No problem, you're welcome. That's what we're here for, to help out or fellow players.

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Posted: Thu Jan 01, 2009 4:27 pm
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Blaqdog wrote:
ronbeeglejr wrote:
Did you make sure the pedal was off? Even a true bypass pedal will not pass the signal if you switch it on. By having the effect off your are essentially "bypassing" the FX circuit. Thus it's only traveling across the switch. Does that make sense? I thought the Big Muffs were true bypass, but I might have that confused with someother pedal.


Oh :!: well in that case it is true bypass :D . Thank You.


Ok wait a minute so it worked when switched off without power ???? sorry dont have it clear :)


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Posted: Thu Jan 01, 2009 4:55 pm
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ok, plug your guitar into the effect. With the power to the effect turned on so you see the LED is on, turn the effect OFF so you know it's mechanically off. Now remove the power source, plug the lead from the pedal to amp and see if you have sound, if so it's true bypass. I think that's about as simple as I can explain it.

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Post subject:
Posted: Thu Jan 01, 2009 4:57 pm
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Synkronized wrote:
Blaqdog wrote:
ronbeeglejr wrote:
Did you make sure the pedal was off? Even a true bypass pedal will not pass the signal if you switch it on. By having the effect off your are essentially "bypassing" the FX circuit. Thus it's only traveling across the switch. Does that make sense? I thought the Big Muffs were true bypass, but I might have that confused with someother pedal.


Oh :!: well in that case it is true bypass :D . Thank You.


Ok wait a minute so it worked when switched off without power ???? sorry dont have it clear :)


the signal from the guitar to the amplifier was unhindered by the pedal. The pedal doesn't work when it's unplugged and switched off without power, but the sound from the guitar to the amplifier is present. So even with the pedal off it still sounds as though the guitar is directly plugged into the amp. I hope that makes sense.


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Posted: Thu Jan 01, 2009 5:19 pm
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Ok, that shows you that it's true bypass. If you had any type of Boss pedal it wouldn't let any signal with power.

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Posted: Thu Jan 01, 2009 6:20 pm
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Interesting point, but I wonder ..... could there be other pedals that are True bypass but won't work without power? :)


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Posted: Thu Jan 01, 2009 6:39 pm
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Nah, the whole thing with true bypass is that when the effect isnt on, its completely out of the signal. The battery or powersupply only powers the effect and doesnt get anywhere near the bypass part. So removing that wouldnt harm the signal.

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Posted: Thu Jan 01, 2009 6:41 pm
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Synkronized wrote:
Interesting point, but I wonder ..... could there be other pedals that are True bypass but won't work without power? :)
No A true by pass pedal removes the circut board completly from the line by way of a permanent jumper. You can have some still work when off and no power though because it depends on the type of switch used and if the circut is being removed or just allowing the signal to pass through bosrd itself when off which would not be a tru by pass because the board still puts some signal load on line. Its all it the switch.

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Posted: Thu Jan 01, 2009 6:55 pm
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Hmmmm. I have an original crybaby I bought new and never modded. Not long ago, I took the battery out at practice to use in my distortion. Next practice I forgot about it and plugged the wah in as usual, I went to use it and had no wah effect but still had signal. I then remembered I took the battery out. So I know its not true bypass and I had signal both engaged and unengaged.

That makes me think this test could give false results. Any thoughts ?


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