TB Lowtone is an innovative bass synthesizer app and AUv3 / IAA plug-in that stands out with its loudness-domain harmonic synthesis capabilities. Developed by Dirk Breebaart, this app features three analog-simulated, voltage-controlled oscillators with various waveform algorithms, PWM, FM, and oscillator hard sync. It also includes a voltage-controlled noise synthesizer, parameter modulation, and a re-designed non-linear voltage-controlled filter.

One of the key highlights of TB Lowtone is its loudness-domain synthesis technology, which ensures deeper, more consistent bass sounds by adjusting harmonics individually to compensate for loudness deviations across frequencies. Additionally, the app offers modulation options with two extended low-frequency oscillators, an ADSR envelope, a gate editor for creating modulation patterns, and effects like reverb, chorus, delay, and a peak limiter for polished sound production.