[HN Gopher] Stack operations on a guitar loop pedal
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Stack operations on a guitar loop pedal
Author : whatrocks
Score : 24 points
Date : 2020-12-03 15:28 UTC (7 hours ago)
(HTM) web link (www.charlieharrington.com)
(TXT) w3m dump (www.charlieharrington.com)
| tenebrisalietum wrote:
| The article doesn't describe a stack. The closest thing is
| progressive bitwise OR operations on a ring buffer, good until
| your whole ring buffer is filled with 1s.
| whatrocks wrote:
| This does seem like a better analogy. The visual display on
| this particular loop pedal is a ring, as well. I'm going to
| think more about this!
|
| [edited: added word "pedal"]
| ericwood wrote:
| I guess it's a stack in the sense that each additional loop is
| being pushed onto a stack of sorts. This is how the Ditto looper
| I use works, and you can even perform the "pop" operation and
| back out of an additional layer.
|
| I'm working on a digital delay pedal at the moment, and the
| underlying data structure is really similar in principle to a
| looper in that it's a ring buffer that continually loops around
| (although a bit more complex since the delay time can change!)
|
| In actual production loop pedals I'm sure there's optimizations
| that can be done, but a naive implementation of the layering
| would just mean creating additional buffers for each layer, and
| keeping the read/write pointers sync'd between all of them. The
| output then just becomes a mixed version of all of the loops.
|
| When a loop repeats over itself, the buffer would read the
| existing value and write a mixed version of the two signals.
| InitialLastName wrote:
| Isn't the ability to back out of the stack context basically half
| the point of stack operations? Without the LIFO behavior, it's
| not really a "stack" in any computational sense.
| whatrocks wrote:
| You definitely can pop off the last layer in the loop stack,
| but my particular pedal seems to require another accessory in
| order to be able to do that (there's a separate pedal you
| attach to this one).
| Raro wrote:
| I like the suggestion of the analogy in general. But a metaphor
| I'd use is a feedback system with a very long delay and very
| low decay constant. So definitely cyclic from that perspective!
| The signal chain is often split by guitarists with a dedicated
| A/B box too. So a fuller analogy would be a more complex
| pipeline.
| whatrocks wrote:
| Yeah, my analogy is definitely hampered by my novice-level
| guitar chops.
|
| I'm definitely intrigued by the idea of better understanding
| these complex signal pipelines. In fact, a usesthis.com style
| website that shows the pedal box arrangements and signal flow
| diagrams for various guitarists would be a website I'd quite
| enjoy visiting.
| InitialLastName wrote:
| Not guitar-oriented, but modulargrid.net has some big
| people on it (often obscured for security purposes).
|
| You can occasionally see guitarists' signal flows and
| stopbox arrays in interviews etc, but the truth is usually
| obscured by prestige, sponsorship concerns, and the
| logistics of touring.
| Raro wrote:
| Thank you for this.
|
| I am currently bread-boarding two guitar pedals for
| myself, and there is great discussion on modulargrid.net
| on filtering.
|
| > You can occasionally see guitarists' signal flows and
| stopbox arrays in interviews etc
|
| It's amazing how much influence these interviews have.
| They have, in the past, directly led to surges in demand
| for, e.g. the Klon Centaur and variacs.
| InitialLastName wrote:
| Trust me, people in the pedal-making industry know
| exactly how much influence those interviews have, and
| that's why they put so much effort into making those
| artists happy.
| bonzini wrote:
| They don't make them "as happy" as you might imagine.
| Even a guitarist that is good enough to do European tours
| and get an endorsement deal will get discounts of 20% (on
| pretty expensive stuff for which they would have to fork
| out 2000 euros), maybe 30% on bespoke instruments that
| cost even more.
| Raro wrote:
| On the contrary, I personally think the suggestion is a
| useful thought exercise.
|
| There are a lot of interviews in Guitar magazine on the
| total rig used by particular guitarists. For example:
| https://guitar.com/wp-content/uploads/2020/09/rig-diagram-
| Ma...
|
| Of course, this includes the whole signal chain, including
| the pick!
| UncleEntity wrote:
| During one of my daily perusals of the YouTubes I came across KT
| Tunstall[0] going into detail on how she does live looping for
| her shows. Apparently, I'm not up on the pop scene, she's pretty
| well respected as one of the best 'loopers'.
|
| [0] https://www.youtube.com/watch?v=liOOHp61nZE
| PaulDavisThe1st wrote:
| I don't want to be dismissive of any musician's practices and
| work, but I couldn't really see much evidence in that video or
| a quick YT search for KT Tunstall as a really good looper.
|
| If you want to get an idea of how far you can go with live
| looping, this is one of my favorite videos (Rico Loop wandering
| around Berlin with looper, a mic and not a whole lot more).
|
| https://www.youtube.com/watch?v=CWc3W8WgFWw
| gokhan wrote:
| This is what I like
|
| https://m.youtube.com/watch?v=Qwb6wPStEpY
| lflux wrote:
| Her track "Black Horse & The Cherry Tree" live showcases it a
| lot better - https://www.youtube.com/watch?v=vp0Pt-VFe_g
| resu_nimda wrote:
| Mark Rebillet is pretty good.
|
| https://www.youtube.com/watch?v=sRpUr5iQPIY
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