TwinCh engine demo

Next thing I want to try is a vibrato and/or portamento. Maybe also a way of having some arpeggio presets for major/minor/7th/9th chords etc.

Here's another demo, I saved one of my Tritone songs with QChan in Beepola. I just swapped channel 3 melody/chords with channel 1. No editing of the song, just saved it out.  Some notes are out of range and errors happen near end of song.

And of course no vibrato/pitch bends yet, I'm working on that now, using channel 3 for channel 2 note pitch adjustments.

Also, it can play about double the speed of Tritone, so it should be able to do some super fast arpeggio's and create some cool sounds at its fastest speed. Though song data will be huge,

Yes, also if you make your patterns with no gaps it will get smaller (Beepola Edit Pattern shrink pattern/2), just play at slower tempo.

I'm saving a version for small data/player. And making a new version which has vibrato/pitch bend for channel 2 notes. I've moved channel 2 to channel 3. Channel 2 column will contain pitch bend adjustments for channel 3. So it will be about 2/3rds the size song data of QChan.

Edit: Or with lots of editing to how the player reads song data, songs could get MUCH smaller. Similar to how the SpecialFX engine does it. Each row will get bigger, but the length of the pattern will get much smaller. And having loops for bass lines and drums will shrink it further. Player will get much bigger but songs will be tiny compared to now.

Edit2: I transposed Eve Redux down an octave and rebuilt the frequency table up an octave. The demo2 now plays all the notes. All the notes are in the same range as Tritone. Updated tap attached.

Using a bit of music theory for how to read patterns/songs. And being a bit "creative" with its use. Time signature format can give how many rows in bar/pattern, and timing of each note. For example:

; Time signatures
;  2/4 = 2 crotchets = 1 bar
;  3/4 = 3 crotchets = 1 bar
;  4/4 = 4 crotchets = 1 bar
;  5/4 = 5 crotchets = 1 bar
;  6/8 = 6 quavers = 1 bar
; 12/8 = 12 quavers = 1 bar

; Note lengths
; semibreve              = 1
; minim                  = 2
; crotchet               = 4     ; 1/4 note
; quaver                 = 8     ; 1/8 note
; semiquaver             = 16    ; 1/16 note
; demisemiquaver         = 32
; hemidemisemiquaver     = 64
; semihemidemisemiquaver = 128

Can write in song data something like:

Tempo:          defb 120        ; beats per minute
Sequence:       defw Verse      ; pattern sequence
                defw Chorus     ; pattern sequence
                defw Middle8
                defw 0          ; end marker
Verse:          defb 4          ; number of bars
                defw bar1, bar2, bar1, bar3
bar1:           defb 4          ; 4 * 1/4 notes (like time sig 4/4)
                defb A1,
                defb C2,
                defb D2,
                defb E2
bar1_ch2:       defb 8          ; 8 * 1/8 notes
                defb A4
                defb G4
                defb E4
                defb G4
                defb A4
                defb C4
                defb A3
                defb B3
bar2:   ; etc

So patterns no longer have long columns of 0's wasting space.

I also have an idea for making variations (mood changes), and key changes, to whole tune or just sections, without needing to write any new patterns. I'll show how that's done later. Using modes.

If you'll go the Nth/note with time signatures route, it will be not possible to properly support in tracker-alike editors (I had to replace such formats in some classic engines in 1tracker). Many also consider this format to be difficult to write by hand. So while it may have its own benefits, it dooms the format to never gain popularity.