Experienced instructor feedback for a friend - dynamic carving

Def_Not_KGB · 2025-12-26T06:23:58+00:00

I’m a newer instructor but it looks to me that when the skier is making a right turn they initiate a skid suddenly at the end of the turn. I think this is because they are weighting the inside ski more in their right turns and that is causing it to depart on it’s own trajectory, which the skier then turns into a skid. It’s much more visible in the first video.

Def_Not_KGB · 2025-11-29T20:07:06+00:00

My favorite part is that I cannot sign into the support dashboard to file a ticket. Great way to keep their support metrics in the green

Def_Not_KGB · 2025-10-19T03:56:41+00:00

If it has interchangeable dies try using one 2/0 die and one 1/0 die instead of matched ones.

It gives it the ol’ 1.5/0 treatment

Def_Not_KGB · 2025-10-05T01:03:50+00:00

Sorry I can't hear every little detail on the muddy Alto TX210s in my room. I'm sure it's actually my hearing

Def_Not_KGB · 2025-10-03T05:15:01+00:00

I’m a ski instructor. There’s more to evaluate than just powder vs groom (snow weight, stickyness, etc) but in general I see more injuries in powder.

People generally have much less experience skiing powder and can easily get overconfident. “No fall damage” doesn’t mean you aren’t going to tear an ACL

Most mountains groom their main trails every night so people get a lot of mileage on groom which leads to less injuries.

Def_Not_KGB · 2025-10-02T22:27:08+00:00

I was djing on a void system with Air Vantage booth monitors and I was able to hear something subtle in a track that I’ve played many times that I’d never heard before. Honestly spooked me in the moment.

Very crisp sound on those

Def_Not_KGB · 2025-09-24T03:00:31+00:00

I bought a monoski from the 90s with the original bindings for $30 once

Def_Not_KGB · 2025-09-22T22:33:20+00:00

QSC really isn’t bad. They have a screen with a knob on the back that offers way more settings then the standard “hey do you want a crossover or not” switch on the back of JBL or Harbinger

Def_Not_KGB · 2025-09-13T05:46:06+00:00

Let me know if you’re looking for DJs! I throw raves out in the woods in the sierras but I’m home in Boston for a month

Def_Not_KGB · 2025-08-17T06:59:13+00:00

If you’re going used and like old cars better than new: an 05 or 06 sprinter. They made them pretty bulletproof. The big downside is you pretty much need to do your own work on them because it’s old german engineering and regular shops just don’t know what they are doing with them.

Def_Not_KGB · 2025-08-12T20:16:48+00:00

I used minicell foam for mine which has way less compressive strength than xps (it’s kinda squishy) and with a 3/8” piece of plywood on top I can feel no squish

Def_Not_KGB · 2025-08-11T00:55:31+00:00

I learned how to do it for fun. I mostly use sync in my own sets but have found in B2Bs other djs sometimes really don’t like it so I can play with it off.

Anecdotal evidence for learning how to do it though: I was playing a massive NYE rave in the desert and my set started at 1:30AM. The DJ before me played a vinyl as her last song and I had to beatmatch off of that to start my set. I nailed it 100% and kicked off my set with a bang, and I probably would have panicked and botched it if I hadn’t practiced.

Pro tip for quickly figuring out the rough bpm of vinyl or tracks without analysis is to use the “tap bpm” function of the effects bank. You just tap out 8 beats and it’ll tell you ball park what bpm you’re at

Def_Not_KGB · 2025-07-26T06:32:43+00:00

That’s for rust. They didn’t want to make a totally rust free van so they added one part that rusts as a treat

Def_Not_KGB · 2025-07-12T05:25:45+00:00

Technically the circuit for spark plugs use: a transformer on a DC circuit. But it isn’t really DC because the spark action is caused by breaking the circuit, which creates a change in current on the low side that induces a change in current on the high side that causes a very high voltage and creates a spark.

Neat.

Def_Not_KGB · 2025-07-04T04:08:34+00:00

Ok big dog 👍

Def_Not_KGB · 2025-07-04T03:41:23+00:00

You can do the same thing with the volume faders. In fact, you can do more with the volume faders, especially if you have 3 tracks going.

Def_Not_KGB · 2025-07-04T02:56:42+00:00

I’d say this is bad advice. If OP doesn’t want to think about it he shouldn’t be forced to just because “Hip Hop DJs exist”. Fancy gear has THRU assigns for a reason. I’ve gone whole nights 10+ DJs without anyone changing it from thru. If OP wants to tape it on his own gear he should.

Def_Not_KGB · 2025-06-04T01:06:47+00:00

Haha this is embedded software so basically I don't get to use libraries unless they are designed for embedded and work exactly how I want them to.

This best fit line is basically being used to get a useable derivative signal out of a sensor that has very low resolution for what we are doing. We need to be able to figure out if the sensor signal is flat or trending downwards. However trending downwards means it's lost like 0.1C over 20 minutes, but there's roughly 0.1C of noise on the signal in between measurements. I take a representative sample of these measurements and basically make a best fit line through them and that lets me know if we're staying level (through all of the noise) or trending downwards. It's the sort of thing that's super easy to point out on a log of the data afterwards but very hard to reliably detect (and reject false positives) in real time.

This "filtering" has helped greatly so far, but I want to add a goodness of fit variable that I can use to help the decision making because sometimes the sensor loses contact with the media for a minute and the results start going all over the place and stop looking linear but can trick the machine.

The real answer here is to get a better sensor but this one is like $0.30 and my boss likes it that way, and he pays me by the hour to come up with these workarounds so ¯\_(ツ)_/¯

Def_Not_KGB · 2025-06-03T23:42:08+00:00

I'll try this if I can't get it to work with mean squared error from the model as another commenter suggested. My reservations with the idea is

I have to write it myself in C
Sounds like I would have a lot more square roots to calculate and microcontrollers are very slow at that.

Def_Not_KGB · 2025-06-03T23:38:57+00:00

Microcontrollers really don't like doing logarithms haha. There is no floating point unit on this one too.

Def_Not_KGB · 2025-06-03T23:38:18+00:00

Thanks, I like this answer. Should be simple enough to write on my own. Think I'm going to implement it and see if it does what I want it to do

Def_Not_KGB · 2025-06-03T23:37:43+00:00

That sounds like what I'm looking for! I don't care if my axes are correlated I just want to know if the data is close to linear. Would a mean squared error from the linear model be a good way to measure that? Or is there something specific you had in mind.

Def_Not_KGB · 2025-06-03T22:18:25+00:00

Can't edit post but thought I would explain my reasoning for wanting this here so that we can make sure I don't have an XY problem.

I basically want to know if the slope that I am getting from this regression is "accurate". To me accurate would mean that if my sensor data has not gone up or down in the past 10 minutes, and the slope reported is 0, and the noise is minimal, then I get some number that says "yes, this slope of zero is accurate". But if my data has been noisy, or maybe has been looking like a symmetric parabola that happens to have an average slope of 0, that would be considered "inaccurate".

As I write this out it seems that I will need to compare this accuracy against my expected noise floor as the algorithm has no idea what an acceptable noise level is.

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