Sorry for bumping this really old thread, but this is something i use a lot, and something i use LFOs for. This will work for both samples and VST instruments with only very few drawbacks. The LFOs in renoise are brilliant, and i constantly find new interesting uses for them in combination with instruments and the effect chain.
To make a half-decent volume slicer you need to make an effect chain consisting of at least four units in the Track DSPs section. Drag-n-drop the following DSP devices to the chain: Compressor/Limiter, Gainer, LfoDevice and Gate.
Compressor/Limiter: Set the parameters so that the volume of the input sound is as even as possible.
Gainer: Do nothing.
LfoDevice: Set waveform to Square. Make sure that Desteffect is 02 (Gainer) and that Parameter is 00 (Gain). Set Amplitude to 50%. Set Offset to 25%. Set Frequency to the speed which you want for the volume slicer. The frequency is expressed as TPC, meaning “ticks per cycle”, so the speed will be relative to the BPM, which is nice.
Gate: Here, it may pay off to experiement a bit. Start by setting all the parameters to the lowest possible, and gradually play with Threshold to get a decent sound. After that, just go wild.
It’s also important to properly synchronize the LfoDevice so that volume is turned on and off at the right times. This is done by reseting the LFO at the start of each pattern and by making sure that Frequency is relative to the tempo of the song.
To reset the LfoDevice with the proper phase, i use the effect column command 3673 at the start of each pattern. 3xxx means use Track DSP block 3 (LfoDevice). x6xx means reset the LFO. xx73 means reset the LFO to phase 73. Why 73? Well, this is just trial and error on my part. The LFOs in renoise are filtered, so it’s not easy to tell where the LFO starts. This value will be different depending on the Gate parameters and other things. Try different values until you find one that works for you.
To set a good speed, preferably select one which is an integer divisor of the number 6 (if your song tempo is 6). Good values are therefore 6, 3, 2, 1.5, 1.2, etc. Another interesting trick is using automation to control the frequency parameter to get a gradually increasing or decreasing speed for the LFO.
I hope this trick will be useful for some of you and maybe even inspire more people to play around with the wonderful LFO devices and find new and bizarre solutions to their problems.