[closed] Dervish: 12HP FV-1 euro FX

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cereyanlimusiki
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Post by cereyanlimusiki » Fri Apr 29, 2016 6:00 am

Add me for PCB and Panel

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woodster
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Post by woodster » Fri Apr 29, 2016 6:36 am

Put me down for a set

BARE BONES
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Post by BARE BONES » Fri Apr 29, 2016 7:20 am

1 set please

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SkoPe
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Post by SkoPe » Fri Apr 29, 2016 9:32 am

I'm in for PCB/panel please. Thanks.

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Post by jamsk » Fri Apr 29, 2016 3:07 pm

Up for 1 please.

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Post by BARE BONES » Fri Apr 29, 2016 5:22 pm

1 set of pcbs please :)

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anto32
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Post by anto32 » Fri Apr 29, 2016 7:05 pm

The +/-5V CV input provides full voltage swing at the FV-1 POT input with the corresponding control pot centered. You can get a similar full swing with a 0-10V CV with the control pot fully counter-clockwise, but then you lose the ability to set a offset with the control pot & drive the POT input in a negative direction with the CV.

Thanks for explanations, i'll add cv tools to switch the offset!

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gbiz
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Post by gbiz » Fri Apr 29, 2016 7:26 pm

I just put a few sound examples up in the first post.

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spneca
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Post by spneca » Fri Apr 29, 2016 9:37 pm

I'm in for a set.

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edwinm
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Post by edwinm » Mon May 02, 2016 2:11 am

PCB and panel please!

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insula
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Post by insula » Mon May 02, 2016 2:45 pm

:woah: :woah:

i want 2 pcbs + panel

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bezier
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Post by bezier » Mon May 02, 2016 3:31 pm

Interested, depending on final price though - not sure how funds will allow for another project

Digital Larry
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Post by Digital Larry » Mon May 02, 2016 4:31 pm

For anyone concerned about "where" to get algorithms, my suggestion for reverb algorithms would be to get them from the Spin "free programs" area.

For a way to build your own algorithms without needing to write DSP code, check out:

http://holycityaudio.com/spincad-designer-2/

This program is free to download and is open source.

There are a few reverb blocks in this program, but it's not optimized towards creating the best reverb. It can, however, create a lot of other stuff.

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woodster
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Post by woodster » Mon May 02, 2016 4:46 pm

I'd like to up my order to 3 please :tu:
Just had the pleasure of using one for a few hours today, mind=blown.
Monster good skills gbiz !
Wes Grayscale needs to do a panel for this...

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Swann
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Post by Swann » Mon May 02, 2016 4:50 pm

Add me to the list please :sb:

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Post by j_p_higgins » Mon May 02, 2016 6:14 pm

those demos :love:

and for UK people looking for the spin FV-1

http://www.profusionplc.com/parts/SPN1001-FV1

If enough people are interested we could sort a group buy?

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mckenic
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Post by mckenic » Mon May 02, 2016 6:43 pm

Dammit!

I was gonna wait until the 1st builds were out there and I could see how difficult these were... and although Ive not used it yet, I have a Bus Pirate -

If I could do the programming with this, Id be in for a PCB. Otherwise I'd have to rely on someone flashing the Attiny for me.

Thoughts of a group buy pushing me over the edge :hihi:
:tu:

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gbiz
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Post by gbiz » Tue May 03, 2016 4:41 am

j_p_higgins wrote:those demos :love:

and for UK people looking for the spin FV-1

http://www.profusionplc.com/parts/SPN1001-FV1

If enough people are interested we could sort a group buy?
Profusion is where i've got mine from. No problems buying from them. IIRC their delivery was next day or so. No annoying wait for a week or so.

I was going to suggest a UK group buy. I'd happily organise it but i'm a bit busy sorting out PCBs & panels for this thing :hihi: If someone else wants to do it i'll take 2 or 3. I'd have thought we could hit the 10+ price break.

I just checked a previous invoice & their p+p was £3.50 +vat, so a GB would save quite a bit for people just wanting one assuming whoever organises this ships them on using 1st class letter post.

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Post by Dogma » Tue May 03, 2016 4:57 am

Digital Larry wrote:For anyone concerned about "where" to get algorithms, my suggestion for reverb algorithms would be to get them from the Spin "free programs" area.

For a way to build your own algorithms without needing to write DSP code, check out:

http://holycityaudio.com/spincad-designer-2/

This program is free to download and is open source.

There are a few reverb blocks in this program, but it's not optimized towards creating the best reverb. It can, however, create a lot of other stuff.
Digital Larry werent you cooking up some Spin programs you mentioned in a z-dsp discussion?
look up!

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gbiz
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Post by gbiz » Tue May 03, 2016 5:16 am

mckenic wrote:Dammit!

I was gonna wait until the 1st builds were out there and I could see how difficult these were... and although Ive not used it yet, I have a Bus Pirate -

If I could do the programming with this, Id be in for a PCB. Otherwise I'd have to rely on someone flashing the Attiny for me.

Thoughts of a group buy pushing me over the edge :hihi:
:tu:
It looks like the Bus Pirate would program both the ATTiny (using the 2x3 ISP header) and according to it's 24LC1024 example*, also supports the I2C interface at 3.3V. For the latter, you'd just need to upload each bank's binary & description text to the correct locations in the EEPROM, which i'm sure is doable.

Hmm. Maybe i should add an ISP interface to the Teensy I2C programmer i use, then it could be used to initially flash the ATTiny, & then manage the EEPROM. That would be easy to do.

Unfortunately there's no easy way i can provide a pre-programmed ATTiny for this SMT version. (I have thought about doing a through hole or partly through hole Dervish, & that could have a pre-programmed DIP version. But that would be a long way off & only once the SMT one is all done).

*http://hackaday.com/2008/11/19/how-to-t ... ce/#EEPROM

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gbiz
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Post by gbiz » Tue May 03, 2016 5:29 am

Digital Larry wrote:For anyone concerned about "where" to get algorithms, my suggestion for reverb algorithms would be to get them from the Spin "free programs" area.

For a way to build your own algorithms without needing to write DSP code, check out:

http://holycityaudio.com/spincad-designer-2/

This program is free to download and is open source.

There are a few reverb blocks in this program, but it's not optimized towards creating the best reverb. It can, however, create a lot of other stuff.
As you say, there's plenty of good reverbs out there.

A lot of the other FV-1 programs out there seem to be written for guitar pedals, which is totally understandable as i guess that's been the target market. All the chorus & flange fx have built in LFO with rate/depth controlled on the POT cv's. One of the many items on my todo list is to go through one or two of them & look at replacing the internal LFO with external CV. I'd love to have a chorus or flange controlled by a complex LFO from something like Tides or E350.

What i really miss is a decent multi-tap delay similar to the one TipTop ship with the Z-DSP.

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Post by Altitude909 » Tue May 03, 2016 5:30 am

gbiz wrote:..
Unfortunately there's no easy way i can provide a pre-programmed ATTiny for this SMT version. ..
Viola:

http://www.ebay.com/itm/250670041374?_t ... EBIDX%3AIT

Image

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Post by Digital Larry » Tue May 03, 2016 8:38 am

gbiz wrote:
Digital Larry wrote: For a way to build your own algorithms without needing to write DSP code, check out:

http://holycityaudio.com/spincad-designer-2/

This program is free to download and is open source.
As you say, there's plenty of good reverbs out there.

A lot of the other FV-1 programs out there seem to be written for guitar pedals, which is totally understandable as i guess that's been the target market. All the chorus & flange fx have built in LFO with rate/depth controlled on the POT cv's. One of the many items on my todo list is to go through one or two of them & look at replacing the internal LFO with external CV. I'd love to have a chorus or flange controlled by a complex LFO from something like Tides or E350.

What i really miss is a decent multi-tap delay similar to the one TipTop ship with the Z-DSP.
The FV-1's instruction set includes super efficient ways to make LFO-based chorus. SpinCAD also features a "servo delay" block which is about 1/8th of a second long and can take an arbitrary control input. These blocks are based on the RAMP LFO, but they do not move anywhere unless you move them and I have used these with random LFO and what I guess is called "slewing" - a low pass filter set to a very low frequency - to great effect. It's very easy to make a through-zero flanger.

In addition, there are several multi-tap delay blocks.
One emulates the tap spacing on an old MN3011 BBD reverb chip, although you'd have to add distortion, aliasing, and reduced frequency response explicitly - for that ever-important "emulating the undesirable aspects of vintage crap" vibe. Otherwise it's just a clean multi-tap with fixed delay spacing, time control input (moves all taps together) and individual settings for tap level (which are not pot controllable).

There is a 6-tap delay for which you can set the times of each tap. My goal was to make this stereo pannable per tap but I didn't get there yet.

My favorite is the 3-tap delay with individual control times per tap.

Also there is an 8-tap delay with equal spacing.

I can build new multi-tap blocks pretty easily. I had a ten-tap block for awhile but I never used it and I don't think anyone else did either. So I removed it.

DL
Last edited by Digital Larry on Tue May 03, 2016 9:08 am, edited 1 time in total.

Digital Larry
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Post by Digital Larry » Tue May 03, 2016 8:50 am

Dogma wrote: Digital Larry werent you cooking up some Spin programs you mentioned in a z-dsp discussion?
Yes, I have tons of programs laying around. The main reason for that is that SpinCAD makes it really easy to build FV-1 algorithms, although you do have to understand some aspects of the FV-1 to get the most out of it.

However, recently I have started to do FX design work for hire. I've got 4 customers at this point in time. So I'm a little less geared towards flinging stuff up here for laughs. However the SpinCAD program I wrote and use for a lot of things is freely available for you to use. I try to help people as much as I can if they ask a question on my forum.

DL

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Post by didahdrieghe » Tue May 03, 2016 9:23 am

One PCB and panel please!

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