Cella development blog: new module "Spectrum"

Cella · July 11, 2026, 10:55pm

Hi folks, haven’t been here for a while!

I want to ask for the help with testing of the new module. It uses OpenGL, and I haven’t see many modules that rely on it, so don’t really know how it will behave on various platforms.

Currently it’s called Frequency Analyzer. It’s a simple frequency analyzer with vintage feel - VFD display etc.

Prerelease artifacts are available here: Release Cella v2.10.0 preview (2026-07-12) · victorkashirin/CellaVCV · GitHub

Works fine on mac arm, but curious how it behaves on win/linux. Would greatly appreciate if someone could give it a try!

scook · July 11, 2026, 11:04pm

Installs and runs OK on Win11

contemporaryinsanity · July 12, 2026, 10:47am

Seems fine under linux. Nice low CPU usage.

cosinekitty · July 12, 2026, 11:23am

Another Linux test… this time Debian on Intel x64. Seems to work and look OK:

scook · July 12, 2026, 11:42am

The adjustments available in the menu are all pretty handy. The only thing I miss is a non-segmented meter option.

Dots goes in the wrong direction.

Continuous meters contain less “background noise” than either dots or segments.

Cella · July 12, 2026, 1:13pm

Thanks for testing. Yes, though it adds to GPU load, especially with Bloom on

Cella · July 12, 2026, 1:13pm

Thanks for feedback, I’ll add solid bars.

Cella · July 12, 2026, 4:24pm

Thanks for the testing everyone, submitted to the library.

contemporaryinsanity · July 12, 2026, 8:24pm

Waterfall spectogram module next?

Cella · July 12, 2026, 9:27pm

With OpenGL it should be possible, any preferences/references?

contemporaryinsanity · July 13, 2026, 4:58pm

Options for horizontal or vertical scroll (not redraw).

Adjustable speed / gain.

Extra points for a selection of colours?

Cella · July 25, 2026, 3:27pm

Ok, I have Spectrum module somewhat ready. Will be glad to hear feedback/suggestions.

Pre-release is on github: Release Cella v2.11.0 preview (2026-07-25) · victorkashirin/CellaVCV · GitHub

contemporaryinsanity · July 25, 2026, 4:12pm

First impressions, very nice!

Don’t see the point of the clear input.

Finer control over what you call ‘history length’ in the menu would be nice, nicer would be a speed control instead of the clear input.

CPU hit negligible

Cella · July 25, 2026, 4:19pm

Thanks for testing!

Clear input: if someone wants to test in automated way: on trigger clean buffer, start playback and freeze. But yes, perhaps can be switched with speed on the panel.