I've never really found a satisfactory tape delay in Pd so here's a new thing inspired by vintage tape delay machines. Running on MobMuPlat tested on Android smartphone and iPad mini or, of course, desktop.

Time knob from 50-2800 milliseconds.
Feedback knob can be turned all the way to create a loop.
Drive adds a soft overdrive.
Dry/wet is a mix knob.
Smear moves two of the three playheads to non equal positions so that it creates irregularly spaced echoes and it is subtly different each time you turn it on.
Four presets are built into the top four buttons.

coronalay_poca.mmp
coronalay_paad.mmp
coronalay.pd

mda Delay.vst.zip

[vstplugin~] v0.2.0
WARNING: on macOS, the VST GUI must run on the audio thread - use with care!
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print: search_done

Ah, never mind, I see there's [cyclone/overdrive~] which does the same thing and it works fine 88 times. Thanks.

Kraken a low-cpu, compact, highly versatile guitar effects stompbox

Intent:

Make a guitar effects rack that would

1. do a lot (includes 8000 pedal combinations)
2. cost very little cpu; and
3. eliminate the need to "connect" effects abstractions

(Master-Kraken-help.pd is the main patch.)

Kraken.zip

The Stack (in this order):

eq3
pre (gain)
3 effect/pedal slots (with clean-dirty "bypass" toggle for the whole set)
with each slot containing
a (tof) menu to select from 21 effects (0 being raw)
3 parameters (mknobs)
a dry-wet slider
a bypass toggle (for that line which crossfades in and out (set by the crossfade control, in ms)
and
an infinite sustain toggle (for that line)
reverb (with brightness and roomsize control and off|on toggle)
compressor (with threshold, limit, ratio, attack, release (zexy~))
master out level.

Kraken also includes:

a simple recorder (record and play (loop) toggles and recording the entire result)
a popup (standard tuning) guitar tuner
an [ adc~ | sample ] (a|s) switch (to test the sound or even post-process a track/file using openpanel)
and
a presets control which loads or saves the current settings (for the entire rack and includes a date+time prefix as well as an entered name for each preset).

Additional Info:

OpenSoundControl (OSC) has been exposed for a future/additional post ("Kraken-OSC") which I have almost finished in Mobmuplat (only, for now, PdParty and others to be added later) and can be accessed via the send and receive to network abstractions inside the patch.
**
EFFECTS LIST:
00-raw
01-chorus
02-compressor
03-delay(3-tap)
04-delay(fb)
05-delay(spectr)
06-distortion
07-filter
08-flanger
09-fuzz
10-looper(fw-bw) (>0.5 on, <0.5 off to record, play forward, or play backward)
11-octave_harmonizer
12-overdrive
13-phaser
14-pitchshifter
15-reverb
16-step-vibrato
17-tremolo
18-vcf
19-vibrato
20-wah-wah

Dependencies:
(which I believe are all available in Deken)
zexy
cyclone
moonlib
iemlib
ggee
plus zexy~ "load on startup"

Credits/Thanks/Acknowledgements:

As I think with most pure data patches Kraken is built on the back of lots of other people's hardwork and diligent effort. In particular, it owes its effects to predominantly the DYI2 library (by Hardoff), the Stamp Album library (by Balwyn), those on the Guitar Extended website (by Pierre), and less so to a few others. And to all of them, I am deeply thankful.

Tally-Ho! Happy playing.

I am very thankful to finally "Release the Kraken!". I hope it may bring you many hours of pleasure, entertainment, and possibly education.

p.s. if you see some of your work inside this, DO please let me know and I will credit you more specifically.

Thanks again. Feel free to ask any questions you may like regarding using the tool, the abstractions, etc., and I will respond to them as soon as I am able. -Peace

I usually rely on various trigonometric functions for tube-like overdrive/saturation (tube and transistor characteristics are very close to tanh functions). Both atan and tanh sound good. You can do interesting things with the cos~ object too, beefing up your signal slightly by keeping it between the proper range before feeding it through a cos~function:

drive1~.pd

You can do a cheap tanh approximation with this formula: tanh(x) ~= x * (27 + x * x) / (27 + 9 * x * x). There's another way of doing it with exp~ which is accurate but more cpu expensive. I'm attaching patches/abstractions for both:

tanh2~.pd
tanh~.pd

[cyclone/tanh~] is also really good for overdrive without the rough edges.

Simplest overdrive/distortion/fuzz type effect is multiplying a signal and then clipping it.

adc~
|/
[*~ 5]
|
[clip~ -0.2 0.2]
|
dac~

Played a bit with Automatonism. Really neat as an intro to Pd!
Did notice that Johan put several effects on there, including stuff like Bitcrush and Wavefold which affect the sound to make it dirtier. But it doesn’t really have one for overdrive/fuzz/distortion.
Maybe this will help?
https://guitarextended.wordpress.com/audio-effects-for-guitar-with-pure-data/
They do mention for the fuzz example that a more realistic one could be achieved with waveshaping (which is something Automatonism does do in some modules (at least in the Bandwidth limited oscillator). So, if you’re not getting the fuzz you want, you might find some answer there. But it’s probably a good idea to start mangling the sound with the existing “sound processors” modules. Don’t forget that you can send one into another for added complexity. Everything in Automatonism is at audio rate.
Sorry if this isn’t the straight answer you wanted. Surely, some Pd experts will have much better insight. Just wanted to chime in as it helps me in my own experimentations.
Oh, and this might be inspiring:

Hi Folks!
I've created a saturation/overdrive effect. It's based on Miller's E05.Chebychev example in Pd, and I've "tuned" it by ear through experimenting with different transfer functions. It's cheap and dirty, but does the job!

Play with it, hack it, enjoy! All feedback welcome!

James
saturation~.pd
saturation~-help.pd

If it's any help, [overdrive~] in the Cyclone library does (I think) the same thing as tanh~.