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How to create user algorithms
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The GSP's factory algorithms, especially in "Artist" software, aren't bad. They provide most of what you ever need. However it might make sense to create your own algorithms.

This seems to be hard to many GSP-2101 user's, but once you know about the few difficulties, it's pretty easy. Basically, you have to have an imagination of what the singe effects do to your sound and in which way to wire them up for best results. You can refer to the effect basics on a previous page of this site.

Sure, you have to know, how to add effect modules to your algorithm and how to link them, but that's pretty well bescribed in the GSPs user's manual.

Another thing you have to remember, that the RAM and CPU rescources are limited, so you can't make an algorithm with Stereo GigaVerb, 4-phase chorusses, several 5 sec. delays etc. That would be way to huge to fit into the GSP. Nevertheless, you can put a couple of effect modules into an algorithm. Too many effects wouldn't make too much sense anyway.

In many cases, it is possible to select just a smaller chorus, delay or reverb so your algorithm still fits.

The most important thing to be aware of is the usage of the mixers. If you are used to wire up stomp boxes, you don't have to think much about this. If you want to create user algorithms on a GSP, mixers a vital. Nearly all stomp boxes have an effect level knob that actually is a wet to dry control.

The output level control of the effect modules is just for adjusting the volume of the effect, but it doesn't mix the effect sound with the original signal. You have to do that separately after every effect stage!!!

The picture above demonstartes that pretty clearly. The "3x2" mixer adds the original signal to the output signal of the dual chorus (DCho), it's the choruses' wet to dry control . The "4x1" mixer does the same for the stereo delay (SDly1). The "8x2" mixer is an over all balance. Here you can control the level ratio between the effects.

The "2x1" after the inputs just merges the stereo input signals to a mono signal that can be processed by the Parametric EQ (PEQ3). It would have been better to use a separate PEQ for each input channel, and mix them with a 2x1 mixer and to feed the chorus with that mixer's output, but that wouldn't have fit into the GSP.

The PEQ doesn't require a following mixer stage, because equalizers never have a wet to dry control. All other filter devices like a low pass, a high pass or a cabinet emulation don't require that either.

That's pretty much all about the structure of an algorithm. If look up the factory algorithms in your user manual, you'll see pretty much the same structures

I would recommend you to draw your algorithms on a sheet of paper. That helps you to keep the overview and to figure out, where to place a mixer and how to link the whole thing. On the other hand it's useful when adjusting the parameters of a program that uses your new algorithm.

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Last modified on Friday, 2. January 2009