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The O'Tool Plus is a useful utility tool for those with Eurorack modular synthesizers. It provides visual feedback over a wide range of parameters, from waveshape to BPM. Settings can be saved and recalled on power up for three different "users," which means playing live, in the studio, and at home can all have different settings for how it is used. It is temperature stable and very accurate. Two signals can be monitored at once, with its output being exactly as the input, allowing one to intercept and monitor a signal. There is also a trigger input for clocking calculation features.
The O'Tool Plus has upgradable firmware, and includes jumpers and expansion connectors for personalization and future additional modules.