Octave - chords

[puretube]

The E-H HOG outplays the POG... 

[rockgardenlove]

Oh! And, it's called a 'grade' because moving on is not based on the year, but performance. 12 years if you pass minimum requirements, but if you don't do well you must repeat that grade. There is no guarantee that you will pass the grade, you must actually learn to do so. It is a traumatic and humiliating experience to be left behind, motivation to try and do well.

Jeez, I hope I didn't confuse you further... 

I'm in 10th grade, soon to be in the 11th (started building in the 9th).  Anyways, I might add that nowadays, at least where I live, essentially nobody gets left behind.  Here in Oregon you need parental permission to hold a kid back.  I know plenty of kids who don't do anything, have the worst grades possible, and follow right along.
I might add that you can drop out when you're 16, so in theory most people have their 10th year (grade) as the last required year.

[SeanCostello]

The standard Boss OC-2 octave design is pretty nice: input signal lowpassed, run through flip-flop octave divider, and used to "multiply" the lowpass filtered input signal for an octave signal that retains the dynamics of the input without the buzziness of the pure flip flop circuits. In order to make it handle chords, you need to go multiband:

- Run the input signal through several bandpass filters, of narrow bandwidth, closely spaced together (1/6th octave or so).
- The output of each bandpass filter feeds its own flip-flop.
- The output of each flip flop is multiplied by the bandpassed filter used for its input, to generate a narrow band octave-down signal.
- The narrow-band octave signals are summed together to create a polyphonic signal.

This has been done before in the analog realm before (dbx), but only for about 1 octave of bandwidth, to create a deep bass signal. For full-bandwidth, you would need a LOT of filters. You might be able to get away with critical bandwidth (roughly 1/3 octave), but 1/6 octave has worked better in my experiments. It would probably require the horsepower of a decent quality DSP, and if you have the resources, you probably could use a better pitch shifting algorithm for the same effect plus other effects.

Sean Costello

[Processaurus]

Vanessa, have you played an EBS octabass?  I have one that was broken when I got it ($5 ) and in fixing it I mistakenly replaced an opamp, it most definitely does not track chords, though it seems about as good as the OC-2.  Wondering if the chord thing is marketing BS or if I should track down the correct opamp?

[grolschie]

I'm looking for a octave pedal that works well with both chords and single notes.

An old crappy digital Zoom 505 does the 12 string, octaved chords thing..... not convincingly though.