71 posts since 14 Nov, 2005, from berlin,germany
Hi all. Late to the party as I've just discovered these tools and ToolChain specifically. Great stuff, very useful and nicely put together!
I am using ToolChain at the moment to separate out bands for multiband processing. I would love to do this using Crossover but the way I want to do it is a little different - I'm using Reaper and a script called FxRack that basically replicates the functionality of Blue Cat's Patchwork using native Reaper plugin hosting and routing. It basically places its own splitter and joiner plugins at either end of a grid where you can drop any other plugin in parallel chains. Ideal for creating a flexible multiband setup (or MS or any other combination you can dream up, of course!) if you just split out individual bands that are then summed at the end of the chain.
So if Crossover can be adapted within the ToolChain setup to be able to solo a band and send it out the main outputs, that would work (I wasn't able to figure out how to get standalone Crossover to do this, though I didn't try very hard because I'd prefer to keep the whole thing 64-bit anyway). But for now I'm using multiple instances of Engineer Filter using pairs of Butterworth 2nd-order filters to create Linkwitz-Riley crossovers and thus isolate bands; then the parameters controlling the crossover frequencies can be linked and controlled as one. This works pretty well, and is highly configurable (for example, it's possible to raise the order of the filters to create steeper slopes)... but I believe I'm theoretically missing a step because my research has suggested that Allpass filters should be used to counter phase issues at the crossover points. I'm not doing that yet, though I've experimented with it, but haven't managed to get it set up in a way that makes things sound better as opposed to worse... so I assume I'm doing it wrong.
So a three-part question for Robin would be, a) are the Allpass filters essential? b) can ToolChain / Engineer Filter be used to create Allpass filters as well (I gather they're also just combined Butterworth filters), and if so where should they go? and finally c) what do you think about incorporating a version of Crossover into Toolchain that, rather than splitting into multiple outputs, simply allows solo'ing frequency bands and sending whatever is solo'd to the main outputs? Would be simpler than my homespun chain of Engineer Filters. Although I will confess I'm enjoying learning about crossover design as I go!
OK that's all for now.. again, greatly appreciating your work and generosity in providing these tools to the community, and I look forward to exploring them more! Also, hey, we're practically neighbors, I also live in Berlin!
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music is easy; just start with complete silence and take away the parts you don't like!