Demo of the Kool-Verb

[rring]

I finally got around to making a youtube demo of my FV-1 based Kool-Verb. The original post is here: http://www.diystompboxes.com/smfforum/index.php?topic=108955.0. It works really well and is simple to build. I have a switch mode buck converter power supply in my schematic, to allow for reasonable battery drain. If your always going to use a "wall wart" you can just use a 3.3V linear regulator which will simplify the design further.

                                                                                               

[petemoore]

 Whooooo Yeahhhh [ that's hoo yea with heavy reverb on it].
The verb tone seems to have a nice eq and the bright long delay is a Kool 1

[rring]

your right on the tone. I added low pass filtering on the input and the output to keep down the digital artifacts..it definitely helped.

[John Lyons]

Sounds great! Nice work.

[jubal81]

Wow, that does sound nice. Great work!

[Fp-www.Tonepad.com]

Sounds nice. Fv1 is really cool.

[~arph]

Is it stereo or are you doing some sneaky panning in the mix? 

[rring]

no I am not using the stereo, I am just driving both channels together, but that's a good idea. If you added some phase shift to one of the channels - the "aural vomit" resultant could be pleasing!

[~arph]

 

Mm.. I just think that the video sounds like there is some stereo panning going on. Could be my ears deceiving me.

[deadastronaut]

lovely...i like.

i agree, definitely sounds like a bit of panning going on ..

[Mark Hammer]

Saw some reviews of reverb pedals in Premier Guitar yesterday.  I was interested to see the reviews mentioned the "engine" at the heart of each pedal.  One used a Belton module, and the others used FV-1 chips.

Can't get any sound at work these days, but I look forward to hearing the Kool Verb at home later.  BTW, is that an oblique reference to the song "Cool Jerk"?

[Kipper4]

Great work Ray sounds just up my street.

[rring]

Not sure what is causing the stereo effect?? It must be room acoustics and my stereo mic, because right there at the amp you do not get any sense of panning(either shifting clean to reverb or one reverb sound to another). I just listened to the audio on a laptop so I will have to listen with a better set of speakers and see if I can hear what you are talking about?

Kool-verb is a celebration of all suicide cults but especially those who like reverb - it is not a reference to "Cool Jerk"

[Mark Hammer]

Finally got to hear it, and it was worth the wait.  Very nice sound.  A wee bit of tonal control would make it a delightfully flexible design, and suitable for a broad range of styles.

Where would you see the best insertion point for adding on something as simple as variable treble-cut?

[rring]

that's a good question..... since anything you put in gets "distorted" by the dsp processing you would expect right after the FV-1 output.
However one of the limitations of the FV-1 is the headroom (only 3.3V supply) so putting some passive roll-off in front would help with that a little bit(good enough for guitar direct in).

If I were going to add adjustable tone... I would add a passive attenuating control in front of the FV-1.

The chip provides a third pot control for tone...I pulled  it to ground to give heavy low pass - you could also make that adjustable.  It would be neat to split up the stereo ins and outs and recombine them in some way- perhaps one fed  into the other. I didn't get a development kit and write a custom program ..I just used one of the two built in reverb programs.



you can get FV-1's  for $10.00 from these guys - they ship fast also
https://www.experimentalnoize.com/

[krister]

Nice sounding reverb pedal. Good job!

[Ice-9]

Finally got to hear it, and it was worth the wait.  Very nice sound.  A wee bit of tonal control would make it a delightfully flexible design, and suitable for a broad range of styles.

Where would you see the best insertion point for adding on something as simple as variable treble-cut?

Nice reverb, it looks like your using internal program 011 (binary selection) by connecting the other two dsp pots this would add the HF and LF controls to the reverb.

You can do this within the program for reverb, it chip can use 3 pots for control of the DSP, the code used in my pedal has a damping control along with decay time control. To use your own programs the addition of a 24lc32a eeprom  would need added to this circuit.

[rring]

yes that's totally cool that you can do that.. I was too lazy to get a development kit so I haven't written my own code...I was happy enough with native program, but I am sure you can create some really nice  effects with a little effort. I may have to breakdown and get a dev kit

[Ice-9]

yes that's totally cool that you can do that.. I was too lazy to get a development kit so I haven't written my own code...I was happy enough with native program, but I am sure you can create some really nice  effects with a little effort. I may have to breakdown and get a dev kit

You could just add an eeprom to your Kool-verb and the extra dsp pots, then you have a dev kit of your own, you would need a usb eeprom programmer though to load the software in.

[rring]

Yeah I thought the dev kit has a usb iterface to load the programs that is the main reason to get it- as you pointed out.