Hi,
An attenuator/attenuverter module would be a good option.
For example https://www.modulargrid.net/e/addac-system-addac218
Regarding LFO, Doepfer 145-4, they are 4 simple lfos without VC, but suitable for modulating.
If you want to go one step further, ochd https://www.modulargrid.net/e/divkid-ochd
Best regards,