Community: Message List - The RollerShifter - A guitar arpegiator

Re: The RollerShifter - A guitar arpegiator

support@line6.com — Wed, 19 Aug 2009 13:33:44 GMT

Wow! Fantastic job. What's really impressive is the amount of function you programmed. Certainly no one trick pony!

Now, Line 6 just has to put that in my XTL and I'll be very happy....

Hey, Line 6-make a model pack of stuff like this!

Re: The RollerShifter - A guitar arpegiator

support@line6.com — Tue, 12 May 2009 15:21:27 GMT

Hi,

I didn't use Simulink because it's too different from the final code.

I develloped a code that works like the DSP. The advantage is that you can use all the features of Matlab (loading and writing wav file,...) to tune exactly the sound I wanted.

Then, I just converted all the code into assembly.

The most representative example is that i had to calculate the frequency of each note. In matlab, this take one line. In assembly i head to implement a look-up table which reprensents an important task.

I already shared things, I posted on the old forum how i use the external memory. And how i convert easily my code into a step by step debug code.

I think that the full code is hard to understand because due to storage capacity of the program memory, I had to optimize it a lot.

I hope this will help you.

Re: The RollerShifter - A guitar arpegiator

support@line6.com — Mon, 04 May 2009 20:18:47 GMT

I love it. -especially the disjointed sounds as well as the octave shifts that you are getting. That is pretty advanced.

curious:

How did you use Matlab to help program the pedal? Did you also use Simulink?

What is your goal with this? Do you want to sell the code or modules?, work for Line6?, or share some of your secrets so we can learn from your creativity?

either way, great job!

Re: The RollerShifter - A guitar arpegiator

support@line6.com — Thu, 30 Apr 2009 22:08:14 GMT

Care for sharing it? It would be nice to view the code for this one!

Re: The RollerShifter - A guitar arpegiator

support@line6.com — Thu, 30 Apr 2009 20:31:41 GMT

Amazing dude!!! I am really impressed! I would buy this pedal in a second!!! Nice job!

Line6Miller

Re: The RollerShifter - A guitar arpegiator

support@line6.com — Thu, 30 Apr 2009 10:12:24 GMT

Hi,

Thank you very much for your feedback.

I programmed the DSP in assembly language.

But, first, I wrote it with a high level simulation environments. I used Matlab.

Matlab is very adapted for the development part.

Then I translated the code into assembly.

This way of developing take more times but split the problems. In the Matlab part I tuned the DSP code to obtain the right sound.

And in the assembly part, I only had to solve assembly problems like writting in the external memory,...

I cannot evaluate clearly the development time. I received my kit for Christmas. But I only spent a few hours by weeks on it.

I'm a phd student in electronic. This background helps me for the development of the effect.

Have a nice day.

Re: The RollerShifter - A guitar arpegiator

support@line6.com — Thu, 30 Apr 2009 02:13:04 GMT

Nice Job!! Very cool effect!!

If you don't mind my asking, about how many hours work does this represent? How was the learning curve and do you have a programming/DSP background?

Thanks for sharing the video & good luck.

Re: The RollerShifter - A guitar arpegiator

support@line6.com — Wed, 29 Apr 2009 14:33:38 GMT

Nice one !!

In what language did you manage to create this effect and what's your technique to pitch shift ?

Thanks

Re: The RollerShifter - A guitar arpegiator

support@line6.com — Sat, 25 Apr 2009 02:45:15 GMT

Sounds good, I wasn't sure if this dsp could do pitch shifting that well. Do you have an plans for releasing it?

Re: The RollerShifter - A guitar arpegiator

support@line6.com — Fri, 24 Apr 2009 13:52:57 GMT

Cool! Tnx for sharing...

Reminds me of some fx in the boss gt-6.