Mailist to discuss all issues regarding the Digitech GSP-2101 Guitar FX Processor

I use a Digitech DHP-55/S5000 with my 2101 and MP-1 and this is what I 
usually recommend for a pitch shifter/harmonizer like the DHP-55/Studio 
5000, and also applies to the IPS 33B

We typically recommend that the unit be used in an FX loop of another 
processor like the 2101, and have a split (clean) guitar signal feeding 
the input of the DHP55 as well as the 2101. The pre-amp output (FX 
send) from the 2101 is then fed into the FX-return of the DHP-55 and 
the outputs of the DHP-55/S5000 is then fed into the FX return of the 
2101. Output to the amp(s) are from the 2101 outputs.

The clean signal input to the DHP-55/S5000 is used for pitch tracking 
-- this is the most accurate way to get a lightning fast lock on a note 
(a distorted note is wayyyyy harder to track). The pitch tracking info 
is then passed on to the digital section of the DHP-55 which gets the 
actual guitar tone (with the distortion and all) from the FX return and 
applies the pitch shifting to the distorted tone.

Adrian Teo
Function7 Engineering


On Jan 3, 2006, at 3:48 PM, Graham Pearson wrote:

> A couple of points regarding the previous message from StarString.
>  
> 1. Harmonizers usually work better with a pure guitar tone rather than 
> a processed one.  If you find the IPS 33B is having trouble analyzing 
> your guitar signal after the analog section of the GSP-2101, put your 
> guitar signal through your harmonizer before putting it through your 
> 2101.  I think you'll find this improves your tone particularly when 
> using the 2101's distortions.
>  
> 2. The explanation of the FX Loop settings SUM and NO SUM is not 
> accurate.  Here's the text from MIDIWizard's Help Topic entitled "FX 
> Loop Return":
>  
> Bypass – the FX Loop Returns are off and completely ignored.  From the 
> factory, every program in the GSP-2101 has the FX Loop set to Bypass.
>  
> Summed – the FX Loop Returns are summed together with the guitar input 
> signal using a 50:50 ratio.  Use this setting if you are using a 
> second effects processor to augment the GSP-2101.  In this situation, 
> you would connect the FX Send from the GSP-2101 to the input of the 
> second processor and then connect the output(s) of the second 
> processor to the FX Loop Return(s) of the GSP-2101.
>  
> No Sum – if plugs are connected to the FX Loop Return jacks, they are 
> the primary signal source and any guitar input is completely ignored.  
> If there is no signal present at these jacks, you don’t hear anything 
> from the GSP-2101.  When the jacks aren’t used, No Sum behaves the 
> same as Bypass.
>  
> Use the No Sum setting if you have a second effects processor and you 
> want to bypass the analog section of the GSP-2101 (the Compressor, 
> Distortion, Analog EQ, and Master Volume).  In this situation, you 
> would connect your guitar to the input of the second processor and 
> connect the output(s) of the second processor to the FX Loop Returns 
> of the GSP-2101.
>  
> Planet Texas
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