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Potential to develop an internal FX card

mokomomokomo
edited October 2013 in Feature requests and bug reports
As there seems to be a decent amount of space available inside the LXR, would it be feasible to develop a dual Spin Semi FV-1 board FX pcb mixer that would allow internal routing of the L1 R1 L2 R2 channels as pcb inputs, wet/dry application of effects (series or parallel routing through the DSP) and out to the existing audio sockets on the LXR?

The FV-1 chips are about EUR9.00 each and seem very well regarded. The existing 4 knobs on the LXR could be used to control the settings similar to the hardware shown here http://www.spinsemi.com/mixer_application.html (plus the FX controls could be added to the LXR's own NPRN/CC controller list)

A socket could be available on the FX pcb to allow programming of the chips for custom effects, like this http://www.andrewkilpatrick.org/?p=elmgen or perhaps FX firmware could be added to the SD card. 

It seems the parts could be pretty inexpensive, PCB fab might be moreso. A challenge would be integrating the FX expansion to the current LXR software....

Comments

  • julianjulian
    PCB fab isn't that expensive once you got a few PCBs.
    Only the prototype one offs are expensive.

    I heard of the spinsemi but never really looked into it.
    Audio quality is good?

    In general I don't mind having FX external. The advantage I would see here is that you could save the FX settings together with a kit.

    One would first have to look into the matter of controllin g the spinsemi daughter board, since the AVR has not many unused pins left. One would probably have to cut some traces and attach the fx board to the SPI bus of the SD card or use some kind of midi splitter for the uart from the midi out.
  • dlylinedlyline
    it does have great audio quality, can use eeprom for your own dsp code. not alot of memory so only short delays. i would like to see a 4ch dual chip pcb but dont think it would be that useful as builtin fx for the lxr..
  • RevokRevok
    +1 on this!

    I've been dreaming about an internal PT2399-based delay in my LXR. It's a cheap IC and is very good at emulating those old school murky BBD delay circuits. Gated reverbs and compression would be nice to have as well.
  • fcd72fcd72
    So you want a DSP based add on board that does 4 Channels of Audio, BBD style delays, Gated Reverbs and Compression... and possibly some Chorus, Flanger, Phasing and Pitch shifting? And all this as DIY?

    Kirk: Scotty, how long does it take?
    Scotty: I need 4 days at least.
    Kirk: You have 4 hours.
    Scotty: OK, ill do it in 4 Minutes!
  • RevokRevok
    The key word here was "dreaming" ;)
  • loderbastloderbast
    edited October 2013
    i think the PT2399 stuff would be easier done externaly. just build this or something like that.
    there is no digital control anyways so whats the benefit of building it inside? you would have to find space and drill holes for extra pots etc...


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