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I've just tested it on LMMS with Linux, and it works great!

that's great to learn you're still working on this! I've updated my installation. Thank you.

Could the use of a linux double boot be an option for you?
Or if the problem is the arduino software, trying an older version?

I remember before your last fix one song stopped after only a few seconds. But after your fixed it worked (at least longer).

I've tested on another arduino (a dccduino clone), and it's the same, it stops at the same moment. But this moment seems rather random from one song to an other: I've isolated the part when I stopped, and removed all patterns before it. Then this time it won't stop there, but only after a while.

In the original "bourrasques" tune it stopped after 25 seconds, now with this abridged version, it's after 12 seconds, will it be enough for you to test? Here is the music_data as attachment.
I've put 2 files, one (v0) with the original data, only the part before the bug were removed, but the song last until the normal end. For the other one, I've removed the end, I've only kept the data until it stops + about 3 seconds, so it's supposed to stop after 15 seconds but will stop at 12 sec.
I've also tried to remove the loop (I chose exit instead before compilation) but it's the same, stop after 12 sec (the output data are identical)

Will your arduino reset as well if you plug it to a 5V phone charger, after you've uploaded the sketch?

the one called music_data_snakecharmer.h replays completely. "Incantation" stops after a while, like "bourrasque". The one called "souvenirs"  plays for most of the song, but is cut anyway before the end. The mister beep song replays correctly. What could it be? What is strange is one parts plays well, while later the same part which is repeated will stop abruptly.

I'll test it on another arduino, in case it's the one I use (official Arduino Uno) which has some limitations (but it doesn't stop like that with other engines). I've already encountered differences between arduino versions, for example a shield was working on a clone, but not on the official one, and not either on another clone.

it sounds very good too (I've only tested through an old speaker), very close to original it seems. What you did for getting the conversion is very impressive!

Yet, I've found a few problems:

- I have a song with a very fast tempo of 19 (in the zip it's called music_data_bourrasque.h and the original from zx version can be heard there http://chipmusic.org/garvalf/music/bourrasques ). The arduino code doesn't handle that probably because it's too fast. The song is slowed down, with it seems some accelerations and decelerations (I guess it's not possible to fix this, which I can understand)

- on at least two of my songs, (music_data_souvenirs_tritone.h and music_data_snakecharmer.h) the arduino stops the music before the end, on the first one it's after just a few notes, on the second one it's a bit longer but not much. Probably there are some data which are confusing the engine...

hey Shiru, now people on chipmusic.org want an arduino synth out of this: http://chipmusic.org/forums/topic/19450 … n-arduino/

thanks a lot, again, that's very impressive. I'd say the sound is perfectly recreated on the arduino. On some tunes I know by heart, I can't tell the difference from the original.
For the enhanced version, it sounds sometimes out of tune, in comparison to the normal mode (I've added in attachement a tune which shows this).

I've posted (the same) message there:

http://forum.arduino.cc/index.php?topic … msg3131717
http://chipmusic.org/forums/topic/19450 … n-arduino/

thanks for the link and explanations. Now I understand better the PORT, DDR and Bit parts of the code. It works perfectly this way.

just out of curiosity, do you know if it's possible to change the output pin?

#define SPEAKER_BIT           (1<<7)            //PD7 (Uno pin 7)

if I change to something below 7, it works (I can redefine pin 5 or 6 for example), but for pin 9 it doesn't work. I got an error because of "unsigned char output_state", which I changed to "unsigned int" to avoid the error, but it doesn't output sound with
#define SPEAKER_BIT           (1<<9)

(On my arduino set up with the low pass filter, PIN 9 is already soldered to the audio out plug, but I can add a new wire if necessary)

I don't know about the note off, it's not very noticable, but it's a bit like on some engine which get off on some lower or higher notes (I don't think octode on zx spectrum is like this).

We can hear this if we define a sample case with only C-2 and C-4 playing together. Here is a recording: http://picosong.com/GFX8

first it's C-2 + C-4, then C-2 + C-3, then C-2 + C-3 + C-4, then C-1 + C-2. The problem seems to be C4 which detune a bit.