This Module is currently available.
Dual Logarithmic Slew Limiter Suitable for Many Applications
This module comprises two logarithmic slew limiters, useful for a range of different applications, such as adding portamento to a keyboard, or as a basic A/R envelope generator, gate delay or low-pass filter.
Features
https://www.wavefonix.com/product-page/dual-logarithmic-slew-limiter
These merchants probably sell this module. Huh?