BossAreaForum

Pepe wrote: ↑

Thu Jul 17, 2025 7:27 am

But maybe it is just the same COSM circuit apart from the Uni-Vibe mode that seems to be missing - as well as the knobs "Rise Time" and "Balance" (for the horn and bass speakers).

Fundamentally, the RT-2 and RT-20 have totally different algorithms. We have revamped the DSP engine, and the sound is much improved. The RT-20 was developed over 20 years ago, so DSP technology, CPU power, and modelling methods are now better. We can now reproduce detailed behaviours thoroughly without worrying about DSP resource.

We began researching and developing a more three-dimensional rotary sound based on a real Leslie 122 speaker. An engineer created numerous DSP algorithms, but it was proving difficult to perfect the sound, and the DSP power required was massive.

For a while, it seemed nobody knew how to solve the issue. Gradually, engineers moved on to different projects, but I started looking at the algorithms and documentation again.

Ultimately, smaller DSP technology allowed us to revisit the rotary sound for this compact pedal. We made considerable efforts to create better algorithms without losing the essential elements of the original Rotary Ensemble pedal, the RT-20.

To enhance the RT-2’s three-dimensional stereo sound, we modeled a Leslie 122 in our anechoic chamber at the Roland headquarters using a pair of high-quality, flat-response microphones. We experimented with various angles and set them at the position that captured the best dynamics.