Spin Semiconductor

I don't understand the 'post' processing chorus stuff that is done in a lot of the reverb example programmes... is that explained anywhere? I'm trying to implement the modulated output taps directly in the allpass as shown in a lot of reverb flow-diagrams instead. It's not really post-processing, s...

http://mixonline.com/news/keith_barr_obit_2508/

My condolences go out to his family, coworkers, and friends. I learned a huge amount from his posts here. He will be missed.

Sean Costello

Excellent! I want to try a true dual-channel algorithm, with stomp switches for each of the channels.

Sean Costello

Hi all:

I have a design in mind that would have separate processing for left and right channels. What is the dB value for crosstalk between channels?

Thanks,

Sean Costello

Hi all:

What's the fastest clock speed that works with the FV-1?

Thanks,

Sean Costello

But is there any way to do a freeze of all current frequencies, then on some trigger (footswitch or the attack of a new note) blend between the old note and the new one? I think an actual pitch glissando would be asking too much here, but I think just a volume fade between old and new notes would b...

I was just quiet because I have been working on other tasks. I haven't worked on the FV-1 in a few months. I'm not into that Zen thing anyway. A former coworker put it best: "I don't want you to teach me how to fish. I just want a fish." I do think that a Moog style cascade should be doabl...

Having more time to think about this, I'm wondering if I could do the feedback in hardware, i.e., use 4 single pole filters in series, then output the audio and send some of it back into the input pin. This would seemingly get rid of the feedback delay, right? If you are talking about generating th...

A non-oversampled SVF will work up with cutoffs up to 1/6th the sampling rate. The nice thing about the FV-1 is that it is fixed point, with saturation math, so the filter won't blow up as bad as it would in floating point. It might oscillate, but it won't just "POP!" and go away. By a nic...

A few good books from the last decade: http://www2.hsu-hh.de/ant/dafx2002/DAFX_Book_Page/ - Totally relevant to the FV-1 chip. Various audio effects. After chapter 7 or so, the effects move into the frequency domain, but all the time domain stuff could be used on the FV-1. http://highered.mcgraw-hil...

If the board is damaged, would swapping out the FV-1 fix it? Or is there some other component that could be causing the noise? It sounds like quantization error to me.

Hi all: My FV-1 development kit is kinda noisy now. Is it possible that the chip has been damaged, or have I just never heard the noise? (Disclaimer: running it off of USB power - I will try standalone power next). Also, I have a friend that wants to try the FV-1. What is the development kit price n...

By nesting allpass filters, do you mean inserting an AP in the delay of another? As I recall, there ws no benefit and the code is a bit bigger. The idea is to insert a delay based allpass in series with the delay, inside of a second allpass. For a nice diagram, see: http://ccrma.stanford.edu/~jos/p...

Hi Keith: Thanks for all the info. I never tire of this stuff either. Long lectures are just fine! A few questions and comments: - You describe a "digital" reverb, with lots of echo density, no ringing, and good frequency response. I think that this might be called "Chamber" by o...

Hi all: I was going through the example code for the FV-1, and trying to figure out why different algorithms have their titles. A few questions: - Are the Room, Hall, Plate algorithms defined by their sound, or by their algorithm topologies? - If defined by sound, what are the identifying characteri...