[HN Gopher] Plug a guitar in your C64 and use it as a wah pedal
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Plug a guitar in your C64 and use it as a wah pedal
Author : stefanorastron
Score : 35 points
Date : 2022-09-23 09:08 UTC (1 days ago)
(HTM) web link (www.orastron.com)
(TXT) w3m dump (www.orastron.com)
| rwaksmunski wrote:
| I think Machinae Supermacy band does this:
| https://www.youtube.com/watch?v=XKkmyMKbPKE
| classichasclass wrote:
| Warning to the curious: it is very easy to fry your SID
| connecting directly to the audio in (don't ask how I know this).
| Make sure of your levels before you connect, and don't plug this
| in with the power on in case there's a short.
| diydsp wrote:
| any suggestions to protect it? e.g. buffer with an op-amp,
| right? Any way to use diodes for static protection, etc.?
| [deleted]
| satiric wrote:
| One common way to provide input overvoltage protection is
| through a pair of schottky diodes. This article is a good
| resource https://www.digikey.com/en/articles/protecting-
| inputs-in-dig...
| buescher wrote:
| That's a pretty good article. Also, the classic one-volt-
| or-so voltage limiter is a pair of antiparallel silicon
| diodes. You can put them in series for a bigger limit.
| classichasclass wrote:
| There are some good practical solutions here ( https://www.le
| mon64.com/forum/viewtopic.php?t=55483&sid=2710... ) but the
| most important thing is keep the voltages down. They suggest
| three volts max peak to peak, which seems prudent.
| the_other wrote:
| > don't ask how I know this
|
| Tease!
| stefanorastron wrote:
| ... or emulate the whole thing using a free VST plugin.
|
| (shameless plug)
| TheRealPomax wrote:
| Find the right garage sale and the C64 _is_ a free plugin =D
| seanhunter wrote:
| One thing to note about a wah-wah pedal[1] if you ever want to
| simulate it in software is that if I understand it correctly it's
| a parametric equalizer and when you wobble the peddle you are
| affecting the Q (bandwidth) of the equalization. You can hear
| this for yourself if you use a normal mixing desk, just play
| something, set a reasonable boost to some mid frequency on the
| parametric eq and wobble the Q backwards and forwards. You
| basically get the effect of the pedal.
|
| [1] And it has to be a "wah-wah", not "wah".
| camtarn wrote:
| This is incorrect.
|
| When you move the wah pedal, you're moving the _cutoff_ of the
| filter, not the Q. The Q is fixed.
|
| You're also incorrect about the name. Just 'wah' is perfectly
| acceptable.
| brudgers wrote:
| Wikipedia has it as "wha-wha pedal."
|
| https://en.m.wikipedia.org/wiki/Wah-wah_pedal
|
| Because of the Wha-Wha (or Wa-Wa) effect.
|
| https://en.m.wikipedia.org/wiki/Wah-wah_(music)
| [deleted]
| wkdneidbwf wrote:
| > And it has to be a "wah-wah", not "wah".
|
| this is just not true. guitarists regularly call it either. i
| hear it called a "wah" more often these days than "wah-wah".
|
| anyone will clearly understand and not look at funny if you say
| "wah pedal"
| myself248 wrote:
| YES! Someone finally used the audio-in pins!
|
| The SID has audio-in that can be summed with internally-
| synthesized sounds and routed through the on-chip filters before
| going back out.
|
| I found this pinout in the programmer's reference guide and
| tinkered with it a bit as a kid, but I didn't really know what I
| was doing, so it never went beyond a novelty. Who knew, forty
| years later, that it'd get proper treatment as an effects
| generator!
| camtarn wrote:
| Thanks for explaining - I had no idea there were audio in pins,
| and was searching the page for how they managed to route audio
| to the SID without any modification.
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