Frap Tools 321

Three-Channel Module

Image Frap Tools 321

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Latest User Reviews

1 year ago

Recommended product

Nice design, great build quality, a lot of useful functions offered in a compact form factor

3 years ago

Fantastic value

Not the easiest to understand but works terribly well

3 years ago

Best attenuverter in eurorack?

First, it has a separate switch for inversion, that means you are always in control of zero. Second it has a switch to turn off the offset, which is handy in a live situation. Third, it'll amplify the incoming signal twice the original for "overdrive". Fourth, it has a sum output for both the incoming signals, and a separate summing output for the outgoing signals, and a -6dB switch for each sum output to cool off a hot signal.

It is just 6 hp and gives you 3 attenuverters with the abovementioned properties. Unbeatable?

3 years ago

Gorgeous and really useful.

After using it, you start counting how many opportunities in sound design you were missing without it ... very very useful! And it looks great, too.

5 years ago

This is hands down the best value Attenuator/offset/Mixer available imo.

There are a large amount of features crammed into this and Frap tools deliver exceptional build quality with top quality components.

Don't be put off by the mini pots. This is a superb utility module.

Can't recommend this enough!

5 years ago

Great small utility module

This is an essential module for processing cv signals. I mainly use it for attenuation or amplification but works quite good as a mixer too. The DC offset feature is very useful and something that you won't find in many utility modules of that size.

Leds for +/- are great for visual feedback.

Of course small pots are not that comfortable but this is a small compromise for 6 HP.

6 years ago

Very useful module

This is, at heart, a collection of 3 offset and scale units, so, if X is the input, the output is AX+B for constants A and B. Each works very simply, with a very clean interface, indicated on the front panel, so you know what goes where.

Wher it gets better is that the scale factor can be negative (via a switch), and the offset can be switched on or off. So the functionality includes attenuversion, offsets and (with no input connected) CV generation. Plus, there are common input and output, for summing the channels, so you also get a mini-mixer, or signal booster.

And it works for both CV and audio signals.

All in a rugged, well-designed module with a very clean front panel. Well worth it.

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Technical Data

  • Manufactured by Frap Tools
  • Released in 2018
  • Average price : $107
  • Available per channel: +6 dB level boost
  • Phase inversion
  • DC-offset potentiometer
  • DC offset generator works as a CV source as long as there is no cable in the input
  • Total output with -6dB attenuators for audio and self-generated voltages
  • Auitable for audio signals and control voltages
  • Width: 6 HP
  • Depth: 38mm
  • Power Requirement: + 48mA (+ 12V) / -48mA (-12V)
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