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GMC Forum _ GEAR & PRODUCTION _ Isp Decimator

Posted by: Profanity Mar 18 2009, 12:06 AM

I bought myself a ISP Decimator since my new H&K Switchblade 100w head makes this sound that makes me think of trains "choo"ing when im not playing. people told me to get this, and since i just spent that mutch money on a great amp, i was gonna do the same on a great noise gate. but it feels like its not working correctly..

so here is what i did:
connected head to cab
guitar to decimator to head
turned on everything and sett the amp to where it should be when the band have rehearsals
turned on the decimator and put it to where it stopped the "choo"ing sound while just muting the strings with guitar volume on full

now, while i was playing, i noticed that the "choo"ing continued like half a sec after muting the strings, wich irritated me abit, but at least it did something. but then when i did a powercord in the middle of a song we are going to play, and the length of the tone was drastically shortened.

i bought it to get rid of 1 problem, but now i fixed 1 halfway, and got a new problem as well. is this what i payed for or is something wrong? something i could do to make it work better?

as said, im using a H&K Switchblade 100w head and emg's on my guitar. please help, not long before our first gig and i want at least the sound to be as good as possible.

Posted by: ZakkWylde Mar 18 2009, 12:10 AM

The Noisegate belongs into your Switchblades effects loop and not between guitar and amp. Put it like this:

Effect loop FX send>input decimator>output decimator>FX return

Posted by: Profanity Mar 18 2009, 12:13 AM

ah ok, how does the effect loop work on the switchblade then?

i ask because behind the amp its a -10db button for effects loop and infront there is a effect loop button of some sort. dont know what it does, dont want to ruin something:P

Posted by: ZakkWylde Mar 18 2009, 12:18 AM

That button makes everything 10db less loud what's in your effects loop (all not to be amplified effect pedals belong here like delay, reverb or equalization) If you were using a delay pedal, that button would make the delay tone less loud that the actual guitar tone (you don't need it when youre using a noise gate.

The button on the front activates/deactiates the effects loop

Don't worry you can't ruin you amp with putting a noisegate in the loop, just get two guitar cables and put the noisgate into the loop. It will effect the signal much more in there, so you can roll the gate knob down to the point were it cancels your feedback problem but does not affect your tone!

Posted by: Profanity Mar 18 2009, 12:21 AM

ok, hope this works. thanks!:D

Posted by: inertia Mar 18 2009, 04:02 AM

I think there are many opinions with regards to where to place a noise gate in your setup. I would suggest trying it in the loop but also try it in front of your amp either right after your guitar or right before the input of your amp, i think you will get different results in the 3 locations. My preference is to use it as little as possible otherwise it does have a direct impact on your sustain.

Posted by: MickeM Mar 18 2009, 09:26 AM

With the Switchblade I'm quite positive it's the preamp that "choo". So like said, the noise surpressor goes in the effects loop.
Now, there are two different settings there.
- Serial, which means the entire signal
- parallell, which means the signals takes two paths. One which is uncolored by anything in the effects loop and the other path which will be affected by everything put in the loop.

I don't have a noise surpressor (I pary with the guitar volume instead) but I assume you have to run it with the effects loop in serial to surpress the entire signal. Parallell would still allow preamp signal to "choo" it's way into the poweramp through the path unaffected by the loop.



In short: Put the ISP in the effects loop and set the loop to Serial. I think that will give the best result.

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