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melt

Another newbie question. I appreciate the support. 

Based a suggestion from Graham W., I am trying to apply his delay-line approach to overdubbing at rates > 1 in a varispeed looper I am building. I am adopting this approach from the looper example in Jeff K's/Gregory T's tutorials seen here: 

https://technophony.com/building-live-loopers-in-max/chapter-4-varispeed-overdubbing-looper-gen/

I have to say that the conceptual jump from the previous patch to this patch is quite a challenge for me. 

In any case, my question is regarding the operation to "fill in skipped samples" when overdubbing at sample counter rates > 1. Graham's example is the following:

for (i=0; i<min(32, abs(t)); i+=1) {
	// get the corresponding sound from our past input:
	s = indelay.read((abs(t)-i)/aspd);
	// write it to tape at the writer position
	// using crossfading with existing data
	poke(tape, s*xb, wb, 0, xa, boundmode="wrap");
	// move the writer on one sample in the desired direction
	wb += sign(t);	
}

 = how many samples are skipped, i.e., how many samples we need to fill in (if I am interpreting the other code correctly), and

Thanks in advance for helping me wrap my head around this stuff!

Writing to buffer at rate>1 - delay-line approach questions

varispeed-overdubbing-in-looper-delay-line-approach-to-rate-greater-1

david reason

I've been a long-time Reaktor user, and its Core level has integer types that support bitwise operators. This is especially important for things like ByteBeat. However, I've noticed that Max Gen lacks these bitwise operators. Why is that?

I've been a long-time Reaktor user, and its Core level has integer types that support bitwise operators. This is especially important for...

max-gen-bit-operator

Max Gen bitwise operator

I’m trying to replicate exactly reson~ object in gen~ but it’s beyond my gen (and filter designing) capabilities.

I’m trying to modify the cycling code (help->examples->gen->gen.filters) to add the gain parameter and to have a wider Q (the reson~ objects allows numbers larger than 100, which is the "sonic" limit in the gen~ version) but no luck until now.

twopi_over_sr = twopi/samplerate;    

Hi, 
I’m trying to replicate exactly reson~ object in gen~ but it’s beyond my gen (and filter designing) capabilities.
I’m trying to modify 

replicating-reson~-in-gen~-with-wider-q-and-gain

Replicating reson~ in gen~ with wider Q and gain [solved]

. However, when I try to recreate this using built-in 

, I just can't seem to get it right. Could anyone help me figure this out?

[Image: fede7d1e-8c5f-4cb3-aed5-a05c877d6917.png ]
I've written an AD Envelope in CodeBox, which essentially functions as a...

how-do-i-use-gen-objects-to-implement-the-features-in-codebox

How do I use Gen Objects to implement the features in CodeBox?

I am slowly trying to work my way through learning some GenExpr in order to build a looper. So far it's been going well, however, I've hit a wall in trying to achieve something I thought would be rather simple. 

What I want to do is a "lazy" erase of a buffer, where the erase action start point (in the buffer) is variable, and that the erase loops around the end of the buffer, finishing at the start point (thus clearing the entire thing). 

I've been trying to adapt this algorithm from Graham W.:

Data loopdata(768000);
History erase;
if (erase < dim(loopdata)) {
    end = erase + 32;
    while (erase < end) {
        poke(loopdata, 0, erase);
        erase += 1;
    }
}
out1 = erase < dim(loopdata);

But I'm having a hard time creating the conditions to  make this work when I attempt to wrap the values around the end of the buffer with a modulo operator. 

For example, I can't depend on "erase < end" because at the wrap point, end will be less than erase. Attempting this with different conditions, such as "erase != end-1" thinking it would achieve the same thing as "<" given we're always accumulating in the positive direction, and we always set "end" to a higher value than erase. However, I continue to have issues with the while loop never ending.

I am having better luck using a for loop for this, and defining the size of the erase chunk with the for loop condition. This means I don't need to worry about wrapping "end" and only wrapping "erase"

I also need to modify the if statement so that it doesn't exit at the end of the buffer. I solved this by using a count within the loop to count the total number of samples in the buffer, regardless of start and end.

History count(0);
History acc(0);
History erase_flag(0);

// odub_head is the record head running in a loop, bufop_overdub 
// monitors a button press external to the patch. I'm capturing 
// the location of the record head at the moment I press overdub.

erase_start = sah(odub_head, change(bufop_overdub));
buffer_length = dim(luper_b);

if (change(bufop_overdub) == 1) {
	erase_flag = 1;
	count = 0;
	acc = erase_start;
	}

if (erase_flag == 1 && count < buffer_length) {
	for (i=0; i<32; i+=1) {
		poke(luper_b, 0, acc, 0);
		poke(luper_b, 0, acc, 1);
		count+=1;
  		acc+=1 % buffer_length;
		} 
	}
        else {
		erase_flag = 0;
		acc = 0;
		}

In the above example, "acc" is not wrapping around at "buffer_length". It's like the modulo is not working. The result is a buffer that is only erased between "erase_start" and "buffer_length".

// omitting all the stuff from the above example 
// that is not being changed for this example

History erase_head(0);

if (erase_flag == 1 && count < buffer_length) {
	for (i=0; i<32; i+=1) {
		poke(luper_b, 0, erase_head, 0);
		poke(luper_b, 0, erase_head, 1);
                erase_head = acc % buffer_length;
                acc+=1;
		count+=1;
		} 

wrap at "buffer_length" but it would appear that it's not actually accumulating properly. The end result (I think) is that poke writes a zero at every 32 sample frames, instead of continuously writing zeroes in 32 sample frame chunks. The result is a buffer that is not properly erased. 

I suspect this is due to a misunderstanding in how these loops work, and doing an equals operation as opposed to an accumulate. I also don't fully grasp the idea of a History declaration, which I think is hindering my progress. I am lacking in understand of how the values are held into the next sample frame. I'm also confused with how to get the syntax of the modulo to work with the accumulator.

How can I get "erase_head" to properly accumulate 

Hi all, 

I am slowly trying to work my way through learning some GenExpr in order to build a looper. So far it's been going well, however,...

accumulators-and-modulos-in-loops-help

Accumulators and modulos in loops help

protozoa

I could use a little help integrating either grooveduck or zero crossing faders into the phasor-based sample slicer in gen~. Ideally only a slight delay would be introduced to smooth out amplitude discontinuities. I'm much more comfortable programming in Max but I'm having a hard time with learning gen. I've been working at this for a long time but I'm hoping someone here has the knowledge and skill to do this in a few minutes.

beat slicer and grooveduck and zerox.maxpat

I could use a little help integrating either grooveduck or zero crossing faders into the phasor-based sample slicer in gen~. Ideally only a...

integrating-grooveduck-or-zero-crossings-into-phasor-based-beat-slicer

integrating grooveduck or zero-crossings into phasor-based beat slicer

dequalsrxt

Topic title pretty much. I'd like to send mc messages like deviate, spread etc. to named parameters in an mc.gen~ patch. I swear I've done it before just playing around experimenting but I don't have any saved patches to refer to and now I can't figure out how I did it (assuming I'm not misremembering, which isn't always a safe assumption to make).

Topic title pretty much. I'd like to send mc messages like deviate, spread etc. to named parameters in an mc.gen~ patch. I swear I've done...

targetting-params-in-mcgen-patch-with-messages-like-deviate-spread-etc

Targetting params in mc.gen~ patch with messages like deviate, spread etc.

Emmett Palaima

Hi, I'm using gen codebox on a project for the first time, trying to figure out the syntax. 

I'm getting an error saying a variable hasn't been declared that I have clearly declared just a few lines prior. What is causing this?

Gen Forum