Controls the signal input level fed to the Module. Ranges from Off to 100%.
Controls the level of the dry (uneffected) signal. Ranges from Off to 100%.
Controls the positioning of the dry signal in the stereo soundfield. Ranges from -99 (all left) to 99 (all right).
Sets the maximum delay time available to each delay voice. For example, if DELAYTIME is set to 1000 ms, each delay voice can be set from 0 to 100% of that delay time. Ranges from 0 to 1.4 seconds (Maximum delay times differ between 4th, 3/4, HLF, and FUL module Types.) Half bandwidth delay times automatically double the set delay time used used.
Controls the fade time of the delay repeats. Higher settings take longer to fade out, while a setting of zero could be used to limit the delay to one repeat per voice. The delay provide both positive and negative feedback settings. Ranges from -99% to +99%.
Allows you to change DELAYTIME in real-time, by tapping the TAPIT button at the tempo you want. Delay voice percentages do not change when using this control.
Sets the spread of Diffusion of the Delay Repeats. Ranges from 0 to 100%.
Selects where the Low Pass Filter is positioned within the Delay Module. Positions are: Pre Delay or Post Delay.
Selects the Frequency band that appears in the LPF. Ranges from 25 Hz to 20 kHz.
Controls the output gain of the LPF. Ranges from -12 to 12.
Controls the percentage of DELAYTIME allocated to delay voices A and B. For example, if DELAYTIME (above) is set to 1000 ms and DLYA is set to 75%, the voice A delay time is 750 ms. Remember, each voice in the Module can have any delay time up to 100% of DELAYTIME. Ranges from 0% to 100%.
See Dly A - B.
Adjusts the overall level of the Delay. Ranges from Off to 100%.

RP21D User’s Guide Section Two - Editing Functions

When do I use delay? When you’re the lone guitarist in a band, the Delay can be your best friend. The Delay repeats can create the illusion that there is more than one guitar being played. One trick to using delays effectively is setting the delays to fall in time with the music. This used to mean grabbing a calculator, dividing 60 by the tempo (beats per minute), then dividing that answer by the desired sub-beats . . . Sound like a hassle? Yeah, we thought so too. So the RP21D takes care of all the calculations for you! All you have to do is tap the TapIt (assign the tapit parameter to a footswitch) and manually tap in the desired delay time and the new time is added.

Another common use for delay is for stereo imaging. Very small amounts of delay (10-25ms) can be used to make a signal sound like it is panned to one side. This trick works because of the way the brain interprets sounds. When your left ear hears something before the right ear, it thinks that the source of that sound is found somewhere to your left. You can also use delays set at 30-60ms, which spreads a sound to the extremes of the stereo image. Be careful with this technique if your mix has a chance of being listened to in mono.

Delay Parameters

Note: not all of the parameters listed below are available in all Delay modules.

FX: Lvl

Dry: Lvl

Balance

Dly Time

FdBck

TapIt

Smear

LPF

Frequency

Gain

Dly A - B

Dly C - D

Out

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DigiTech RP21D Delay Parameters, FX Lvl Dry Lvl Balance Dly Time FdBck TapIt Smear, Frequency Gain Dly a B Dly C D Out
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RP21D specifications

The DigiTech RP21D is a versatile multi-effects processor designed for guitarists seeking to expand their sound palette. With its comprehensive range of features and user-friendly interface, this device stands out as a reliable tool for both live performances and studio recordings.

At the core of the RP21D lies its extensive library of effects. Guitarists can choose from an impressive selection of up to 54 different effects, including distortion, overdrive, delay, chorus, reverb, and more. This variety allows musicians to create a unique sound that fits their style, whether they are seeking a classic rock tone or a more contemporary sound.

One of the standout features of the RP21D is its ability to store presets. With 40 user-defined patches and 40 factory presets, players can quickly recall their favorite sounds during a performance. This feature is particularly useful for guitarists who switch genres or styles frequently, as it allows for rapid transitions without the need for complex setups.

The device is equipped with a dual-analog distortion circuit, which provides a warm, tube-like tone that enhances the overall sound quality. Additionally, the RP21D includes a 24-bit A/D and D/A converter, ensuring high-resolution audio processing. This results in a cleaner and more dynamic sound, making it suitable for professional use.

The RP21D features a simple and intuitive interface, highlighted by a large LCD display that provides clear information about selected effects and parameters. Navigation is made easy with dedicated buttons for quickly adjusting settings and switching between effects.

Connectivity options are plentiful, including standard 1/4-inch inputs and outputs, as well as a built-in headphone jack for silent practice. The device also includes a direct output for connecting to a PA or recording system, making it an excellent choice for live situations and studio work alike.

In terms of power, the RP21D can be powered by either batteries or an AC adapter, offering flexibility for musicians on the go.

Overall, the DigiTech RP21D is an impressive multi-effects pedal that combines quality sound processing with a vast range of features. Whether you are a seasoned guitarist or a beginner, the RP21D offers everything needed to explore new sonic territories and refine your musical expression. Its robust construction and reliable performance make it a valuable addition to any guitarist’s rig.
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