Eurorack specialist Bries (https://www.youtube.com/BRiESY) made a demo video of the S-LD module. On the 6th June and 7th July, alternative firmwares have been posted in the support section of the website. They are compatible with the S-LD hardware, also recognizable by the Rev C marking on the back PCB. Please note Rev B (Samples and S-909 purchased in 2022) firmware were also posted but I cannot guarantee 100% that the update will work because of an issue with the USB bootloader of a batch of STM32 used in that batch. You still can give it a try.