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Battle of the Bits Winter Chip XII has a ZX beeper contest: http://battleofthebits.org/arena/Battle … +Chip+XII/

The black metal band is rather cool. My favourite Polish black metal album is "Wicher" by Sacrilegium: https://www.youtube.com/watch?v=RrmnbldZiUQ . Other albums from Poland I enjoy in this vein: "Grom" and "Sventevith" by Behemoth, "Prawo stali" by Graveland, Arkona

wow, I like this one very much too!

it's connected both to the audio out and to the modulator, so I don't know to what extend it's possible to drive a signal to the audio output this way. I know almost nothing about all this so I can't really tell, it's just a guess.

I'm working on a super secret project with a great chiptune composer, it will be a collaborative album but it takes some time as we are both quite busy with other things.
It will be mostly 8-bit tunes, but there are also some 1-bit music as well.

Maybe we could release a little teaser in a few months...

congrat! So now there are already 3 engines... well done.

I think it's my recording which is not very clean (direct line in into a computer). Probably the drums saturate too much.

thanks for the explanations. And the new features sounds really cool! Now it'll be super easy to make ambient music on the spectrum!

A little feedback.

First,
I think the parser could be less strict, for example you can't write:

A=a3, C=d2,

the last comma prevents to compile the song.
As long as there is no data except space, tab or line break, it could consider the comma doesn't exist.

I'd like to see a comment mark (for example to comment a part so it won't play during the rendering)

I like the idea of columns for entering notes. I has an interesting effect, you don't have to enter the value of some notes, like that:

A=g3, B=d2
    A=d3
    A=a3
    A=f3
    A=e3
    A=g3
    
    A=f3, B=c1
    A=d3
    A=e3

here we have for B the d2 note which will last 6 steps, then c1 will last 3 steps. Yeah, basically it's the same as in trackers
I guess also it's easier to parse the notes.

It has some drawbacks however: It's less easy to copy and paste a track (for example channel 2). Some text editors support vertical selection though. When a channel is on a line, you can duplicate it more easily.
I think in addition to the current behaviour, it might worth adding, if possible, independent patterns, it means a pattern could contain only one voice, then you would mix the patterns together for different variations. The current behaviour is like on milkytracker, beepola or vortex tracker, I was thinking to something like on sidwizard or goattracker.

It means something like that would be legit:

     ptn1a, ptn1b, ptn1c

:ptn1a
A=f3, MIXA=and, MIXB=and, PHA=0, PSCA1=none, PSCC=none, SLIDESPD=0, DMOD=off, SPD=8
    A=d3,
    A=a3,
    A=d3
    A=f3, 
    A=e3, 
    
    A=f3,

:ptn1b
     B=d2,
    .
        .
        .
        .
    
     B=f2,


:ptn1c
     C=d2
     C=a2
    C=d2
    C=a2 
     C=d2
     C=a2
    
    C=c2

instead of:

    ptn1


:ptn1
    A=f3, B=d2, C=d2, MIXA=and, MIXB=and, PHA=0, PSCA1=none, PSCC=none, SLIDESPD=0, DMOD=off, SPD=8
    A=d3, C=a2
    A=a3, C=d2
    A=d3, C=a2 
    A=f3, C=d2
    A=e3, C=a2
    
    A=f3, B=f2, C=c2

It might look more verbose, but it could help to design very repetive parts. But maybe it'd be too complicated to parse.

(edit) thanks for the brackets addition, I'll have a look at it. Also for the value, what is correct, PHA=$800 or PHA=800, or is it the same?

I don't understand all the pattern commands effects, but I'll have a try.
In the betaphase.txt it's written
MIXB            Set mixing mode channel 1

I guess it's:
MIXB            Set mixing mode channel 2

ah yes, German notation... I was wondering.
Is it possible to use flat as well?

Just saying, in abc flat is _ before the note, ^ is for sharp and = for natural (but not applicable in mdal). So ^f2 would be f2 sharp and _g2 would be g2 flat.

I think you made something great with MDAL. It's perfectly suitable for this kind of music. The only criticism I could say is I find it less readable to get all the info on the same level for example:

A=a1, MIXA=xor, PHA=$800, PSCA1=down, C=c4, PSCC=down, SLIDESPD=$30, SPD=6

It might be more readable like this, with options between parenthesis:

A=a1 (MIXA=xor, PHA=$800, PSCA1=down), C=c4 (PSCC=down, SLIDESPD=$30, SPD=6)

(but maybe it's just me)

(edit)

I have a newer question. I have a simple example like this:

CONFIG=BetaPhase

:SEQUENCE
    
    ptn0
    [loop]
    ptn1
    
    

:ptn0
    A=e1, MIXA=xor, PHA=$400, PSCA1=none, PSCC=down, SLIDESPD=$30, SPD=12
    A=e2
    A=e1
    A=e2
    
:ptn1
    A=e1, MIXA=xor, PHA=$800, PSCA1=down, C=a3, PSCC=down, SLIDESPD=$30, SPD=12
    A=e2, C=rest, SLIDESPD=0
    A=e1, C=e2
    A=e1, B=f2
    A=e1, C=fis2
        A=e1, C=g2
        A=e1, C=gis2
    A=e2, C=b2

is the speed persistent across the patterns? For ptn1 if I remove SPD=12 then I get a little glitch (high pitch tone). If I set SPD=10 (default?), it's even different.
ok I understand, SPD=16 is default (and I get the sound glitch as well)
SPD=16 is 0x10

I've tried to compile the music.asm resulting from the mdal command (the betaphase.mdal sample), and it seems the 'include "equates.h"' is missing in the output, and I got an error:

ERROR: Symbol 'a1' is undefined

I've included myself the equates.h and it works!