How to play Kick and Snare in 16 Step Pattern?

[Erik Zimmermann]

Hello,
 

i try today make an 16 Step Loop with an Kick an Snare. I tried, unfortunately failed.  

16 Steps Pattern.

Kick on 1,5,9,13

Snare on   3,7,11

Kick: 6 Steps

Pitch     :   30 ,30 ,7  ,7  ,7  ,7

Volumes:   15 , 15 , 4  ,   4  ,  0  ,  0
Waveforms: 15 ,15 ,8  ,8  ,8  ,8

Snare:     6 Steps  
Pitch:       5, 27, 8, 5,5,5
Volumes:  15,15, 15, 9, 6, 3
Waveforms:  8,12,  6, 8,  8, 8

I found a Assembly Code Atari 2600 Music Kit 2.0 Created by Paul Slocum. The Sound was perfect. This is not Batari. 

How can me help me?

Bye

Erik

music_kit_2.zip Speed6.bas Speed.bas

[Fort Apocalypse]

Like this?

 

 

 

example_kick_snare.bas.bin example_kick_snare.bas

Edited June 11, 2022 by Fort Apocalypse

[Erik Zimmermann]

Yes, Thanks. Try it out today.

[Erik Zimmermann]

Hello,

have problem with calculate correct timming for 4/4 beat, 16 Step Pattern, 120bpm and 60 frames.

https://www.vjamm.com/support_av_bpm.php%3Flang=en.html
27 frames for 130 bpm. I must play 4 ticks per 4 beat.
 
T=Tick, X = Play
1 - 2 - 3 - 4 - 5 - 6- 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15
X                  X                  X                         X
T   T    T    T

Can someone help me? Does anyone know a code example?

Bye

Erik

Edited July 7, 2022 by Erik Zimmermann

[Erik Zimmermann]

27 frames for 130 bpm  = 7 frames  (4*4)  = play 4 Notes in 7 frames

 

Edited July 7, 2022 by Erik Zimmermann

[KevKelley]

You should check out the Atari Riff Machine on Alien Bill's website (I think I got that right). 

 

Real easy to do what you are looking to do.

[Fort Apocalypse]

That site @KevKelley is talking about is: https://alienbill.com/2600/atari-riff-machine/

 

It's pretty cool and may help more than what I'm getting ready to say, I don't know.

 

The bpm may vary depending on the code, so I can't solve that, specifically.

 

But, let's say that you need 4 notes in 7 frames. You could maybe do the following:

• Make N a counter from 0 to 27.
• When N equals 0, 6, 13, and 20, do a frame.
• When N equals 0, 4, 8, 12, 16, 20, and 24, do a note.

This is probably not the most efficient way, but here's an example:

mainloop
 if n=0 || n=6 then gosub music
 if n=13 || n=20 then gosub music
 if n&3=0 then gosub frame
 n=n+1 : if n>27 then n=0
 goto mainloop

Attached an example which slows it down and adds 1000 to score for "note" and 1 to score for "frame".

 

Then, your actual implementation of the music subroutine may increment some other counter and pull from data, etc.

 

The problem is that as soon as you start adding code, it may affect the timing. So, you'll have to play with it.

 

If you can get it to work without this much complexity, that may be better, though. Maybe play the music just a little slower or a little faster?

 

 

do_4_things_per_7_things.bas.bin do_4_things_per_7_things.bas

[Erik Zimmermann]

Hello!
Thanks for the information. Will try it right away. saw it too late Had no internet last week.
That should solve the timing problem.

Bye
Erik