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madchap 12/30/2006

DigiTech RP21D : madchap's user review


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1 instrument input
Output 2 (right and left / mono)
1 headphone output
An adjustable volume input and output 1
1 SPDIF output
An expression pedal (volume, pitch, wah ... or more at a time!)
1 MIDI In and one MIDI OUT / THRU

There is as an unofficial editor for PC.

There are all the effects that one may want and even more (the list is really too long), acting analog (12AX7) except for modulation (digital)

Here is a short list (these are modules, there are obviously sub-groups!)

Reverbs (halls, rooms, springs and gated varieties).
Analog distortion
Digital distortion
Chorus (dual, quad and octal types).
Rotary Speaker Simulator.
Auto Panner.
Pitch Shifter (Including harmony generation).
Delay (mono, stereo, most similar modes Tap function. Maximum delay time = 10 seconds but it depends on the power allocated to the processor module for the delay).
Sampler (mono and stereo sampling).
Equaliser 10 NADB (mono or stereo, graphic and / or parametric).
Whammy Effects (DigiTech quality!).
Auto Wah.
.... Etc.

Digital: - Chorus - Flange - Rotary speaker simulator & - Tremolo - Automatic pan - Delay - Analog Delay - Chorus / Delay - Flanger / Delay - Reverse Delay - Time loom - Sampler - Reverb - Gate Reverb - Spring Reverb - Pitch shifter - Harmony - Automatic wah - Graphic EQ - Parametric EQ - Speaker & simulator ..... etc.
Technical Specification of manufacturer:

● A / D Converter: 20 bit 128x Oversampled ● D / A Converter: 20 bit 128x Oversampled ● Sampling Frequency: 44.1 kHz ● DSP: Static-Dynamic Instruction Set Computer II (S-DISC II TM) ● Digital Signal Path Width: 24 bits (144.5 dB) ● Internal Data Path Width: 48 bits (289 dB) ● Dynamic Delay Memory: 256k x 24 bits (5.94 seconds) ● Static Delay Memory: 256 - 24 bit registers (6.55 milliseconds) ● Data ALU Processing: 10.0 MIPS ● Address ALU Processing: 15.0 MIPS Multiply ● Size: 24 bits x 24 bits Conector ● Input: 1 / 4 "unbalanced ● Nominal Input Level: -8 dBV ● Maximum Input Level: +10 dBu ● Input Impedance: 470 Ω ● Output Conector : 1 / 4 "unbalanced / balanced TRS x 2 ● Nominal Output Level: +4 dBV Maxmum ● Output Level: +18 dBu ● Output Impedance: 50 Ω ● Digital Output: S / PDIF ● MIDI: In, Out / Thru ● Memory Capacity: 128 = Factory Programs, User Programs ● Frequency = 128 responces: 20 Hz - 20 kHz +0, -3 dB ● S / N Ratio Greater than 90 dB, ref = max signal, 22 kHz measurement bandwidth ● THD: Less than 0.04% (1 kHz) ● Power Requirements: 100 VAC, 50/60 Hz, 40VA 9V AC (AC Adapter PS0940-100) ● Tube Complement: 12AX7 triode x 1, 145 volt power supply ● Set 's: 609 mm (W) x 57 mm (H) x 210 mm (D) ● Net Weight: 5.44 kg


The edition of the sounds is very simple and logical, everything is visible on the screen, there is not even need a manual, just read, but the manual is quite clear throughout.

The only thing that may confuse some at the beginning is the programming of the expression pedal either for volume, pitch, the wah or a morphing between two effects, for example ... but it really is not very terrible and two or three attempts are enough to understand the method (which could be more detailed in the manual)!

In this regard the part dedicated to MIDI could also be more detailed, but the designers of the manual have probably think that those to whom it is addressed and who manage rack / MIDI header already know ... do damage to the newcomer in the field, it is not DigiTech which will advance!


Although this pedalier date of 1999, the sounds are still relevant and even better than a lot of current multi purpose! I use the loop in parallel of my head.

The clean and crunch sound are simply stunning, nothing more to add! All effects are adjustable, controllable and assignable real-time without any latency issues.

Distortions (2 types, either analog or digital) are yet a bit off from what is being done, but you still have to clarify this and put things in their place! If one does not seek to go beyond the realm of rock / heavy metal, in this case, they are still at. The crunch sounds and other overdrive / distortion (analog) are very good quality and it is only in the field of metal that is a fair bit (even if we can get a lot of things by combining the two types of distortions and playing with the equalization (or band parametric ),... recess without either the must of its kind! ... changememt a lamp can be the help that I ... probably!)

I would note is that almost nine for ten years, it is far from being exceeded, even by recent DigiTech, to stay with the same manufacturer. The effects are largely on the level of a Tonelab (I had), but with the color, however, well known and own a DigiTech (which I prefer, but not as the Tonelab is worse!)


I used long ago, I redeemed a recently because I always remember the quality of this machine, yet it is not lack of choice these days (I may be a little too nostalgic!). As long as you take the time to program sounds, it offers pedalier PARAMETERS editable so that we can reproduce a can ready anything! (It takes about a good half hour, knowing that his you are doing, but 30 seconds for "sound basis" so it's easy!)
If we judge the value for money when it was released, this multi purpose was a bit expensive, since it would indeed ready for 7000 francs! Today the price it sells or it is a very very good opportunity and it is even more so if like me you have a head (or amp) can give a helping hand for very large modern distortion .