Your both half right
you need some terms defined and to learn a few new rules.
If your sending out 30K samples per second from a sound card your max output frequency before aliasing and distortion set in is a little below 15 kilohertz, from sampling theory. A fellow named Nyquist and a fellow named Shannon worked that out. You can look up Nyquist and Shannon on the web. Modern sound cards that do 48 or 96 or even 128K samples per second have theoretical bandwidth of 24 khz, 48 khz or 64 khz, but they actually are oversampling, ie they take each data point a few times and interpolate that waveform back in the audio frequency range, they actually have output filters that limit them to 15-20 kilohertz audio. You can also undersample, but you loose resolution and can shift the frequency of the recorded signal, thats a discussion for another day.
so for a scanner with 2.5 kilohertz of bandwidth theoretically you need to have a sound card with a 5 khz sampling rate. that same galvo maxes out small step at about 750 max points in a frame, go figgure.So James Lehman (laserboy creator) can oversample about 6 times with a standard card, and work some real magic in the color control area with dithering etc if he so chooses.
Now there is vector, and there is point by point. Traditional laser uses point by point, and uses the galvo's low frequency bandwidth as a mechanical low pass filter, smoothing out curves etc. You can go a little faster and smoother using vector, where you oversample and fill in signal between the points that would make up a point by point image, that is known as "vector" in the LS industry
Pangolin can do both , ie you can designate a frame or animation as point or vector. vector has some advantages in a given jump size area over point by point, and animations can look smoother with vector, but a lot depends on how the galvos are tuned. the ILDA test pattern is for point by point.
Now you two kiss and make up and respectfully agree to disagree on terms. then go look up Dr Nyquists law as homework or I will write you both a detention and put big mirrors on your scanners . :-) for bonus points, look up ballistic motion and inertia on a servo web site like da Dr says.
PS, btw, it looks like scope boy is cheating, and is adjusting the persistance control mid show on a STORAGE scope, ie the scope screen has the ability to keep a image up for a controlled amount of time after it has been scanned by the electron beam. He's be really dissapointed by a laser's short persistance.
Steve Roberts