Search found 9 matches

by Keith
Tue Dec 02, 2008 12:08 pm
Forum: Algorithm development
Topic: Ringmodulator
Replies: 18
Views: 19983

To do a ring modulator, you need to multiply an input signal by an LFO. The internal LFOs of the FV-1 are limited in frequency range, but this should work: Start by initializing a SIN LFO: skp run,endset wlds sin0,0,32767 ;output = +/-1, freq = 0 endset Then adjust the frequency with a pot: rdax pot...
by Keith
Mon Nov 24, 2008 8:18 am
Forum: Algorithm development
Topic: Differences between room, plate, hall algorithms?
Replies: 6
Views: 31356

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. I have built all-AP reverbs though. The first Midiverb had a few as I recall. Very limited RT range, but also very interesting. I find the delays of a typic...
by Keith
Sun Nov 23, 2008 12:51 pm
Forum: Algorithm development
Topic: Differences between room, plate, hall algorithms?
Replies: 6
Views: 31356

Sean: Been thinking this over... Maybe you need my short lecture on reverb programming. I hope its short enough... First of all, if anyone tells you that his algorithm is truly representitive of a real space, he's kidding himself, you, or both. Real spaces are hideously complex compared to a simple ...
by Keith
Sat Nov 22, 2008 5:34 pm
Forum: Algorithm development
Topic: Delay Servo Technique
Replies: 17
Views: 28601

Making a variable delay that does not "zip"... If you're making a commercial product like a guitar amp, and have reserved say, 0.5 seconds of delay RAM for the task, realize that 512 possible delay selections represents 1mS increments... That's tiny. You can make the situation much better ...
by Keith
Sat Nov 22, 2008 5:14 pm
Forum: Algorithm development
Topic: Differences between room, plate, hall algorithms?
Replies: 6
Views: 31356

reverb descriptions

I love your questions, curious are you! To the best of my knowledge, with the exception of some possible inside jokes that I have not been privy to, reverbs are named according to their sound. -Since the digital methods that approximate the acoustics of physical structures are recent compared to the...
by Keith
Mon Aug 06, 2007 11:37 pm
Forum: FV-1 hardware questions
Topic: DV-1?
Replies: 3
Views: 6753

Sorry, not yet. Stay tuned.
by Keith
Wed Oct 18, 2006 10:51 am
Forum: Algorithm development
Topic: History of allpass loop / "ring" reverbs?
Replies: 15
Views: 57213

Sean: Sorry, I just replied to your first message; I'm new to this forum stuff. As a suggestion, think of two taps on a delay, summed to an output; this will cause certain frequencies to reinforce where the delay between the taps causes the two outputs to be in phase, canceling when the phase relati...
by Keith
Wed Oct 18, 2006 10:30 am
Forum: Algorithm development
Topic: History of allpass loop / "ring" reverbs?
Replies: 15
Views: 57213

Sean: Sorry I can't help more. I wrote the article on the website you cited, and it's the result of my experimentation; be advised, filters (HP and LP) within the loop greatly enhance the 'naturalness', if that's what you're looking for. It's the all-pass that does it. Everything comes from the flat...
by Keith
Thu Sep 28, 2006 9:22 am
Forum: Algorithm development
Topic: History of allpass loop / "ring" reverbs?
Replies: 15
Views: 57213

reverb algorythm development & history

Sean: Don't know much about the history, but have spent years developing commercial reverbs. The first reference to all passes I recall was an AES issue that detailed Schroeder's work, a terrible sounding algorythm as described. The tinny sound of the MXR reverb (my work) suffered from this problem....