O’Tool Plus

£315.00 (£262.50 ex VAT)

Sophisticated Oscilloscope & Metering Module, Specifically Designed for Eurorack Modular Synthesizers

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SKU: otool-plus Categories: , ,


The Jones O’Tool Plus is a greatly improved version of the incredibly popular – and highly sought-after – original O’Tool module, and was in development for almost two years. It was finally released in June 2016.

It is an oscilloscope and audio tools module with a myriad of useful features (see below). The updates in the “Plus” version include temperature stable readings, extreme accuracy, added modes, upgradability, and more.

We have had the original version of the O’Tool in the Matttech Modular system since it first came out, and simply cannot imagine running a modular without it. Highly recommended!


Dave Jones otoolplus_screen1  Dave Jones otoolplus_screen2


  • Single channel oscilloscope
  • Dual channel oscilloscope
  • 3D oscilloscope
  • X/Y display
  • Level meter
  • VU meter
  • Peak meter
  • Voltmeter (with p-p and average DC)
  • Frequency meter
  • Tuner (guitar tuner style)
  • Linear spectrum analyzer
  • Log spectrum analyzer
  • Spectrogram
  • BPM meter
  • Metromome

It includes user configurable settings and can remember settings at power up for three users. That means you can have different settings for home, studio, and performances, or any three different sets of settings.

It is temperature stable and extremely accurate. It can monitor two signals, with inputs multed/passed through to other modules. The scope modes include an external trigger option, for synchronising your waveform updating with the frequency of a specific external signal.

It is firmware upgradable. It has a jumper for internal or external 5 volt source. It has an expansion connector for possible future add-on modules.

Width: 8hp
Depth: 40mm
Power: A jumper selects using +5V from the power supply, or generating +5V on-board from the +12V rail.

With external 5v selected: 12mA @ +12v / 22mA @ -12v / 70mA @ +5v
With internal 5v selected : 80mA @ +12v / 22mA @ -12v / 0mA @ +5v