ivop Posted March 1, 2021 Share Posted March 1, 2021 (edited) 56 minutes ago, emkay said: How is this recorded? There's no metadata, but looking at the waveform in Audacity, this is a recording with Altirra. Running the binary sounds the same to me. It also sounds quite good on atari800, and hence on the latest Atari800MacX, if I recall its name correctly Edited March 1, 2021 by ivop 1 Quote Link to comment Share on other sites More sharing options...
emkay Posted March 1, 2021 Share Posted March 1, 2021 5 minutes ago, ivop said: There's no metadata, but looking at the waveform in Audacity, this is a recording with Altirra. Running the binary sounds the same to me. It also sounds quite good on atari800, and hence on the latest Atari800MacX, if I recall its name correctly Would be great to have a recording from the real thing. 2 Quote Link to comment Share on other sites More sharing options...
rensoup Posted March 1, 2021 Share Posted March 1, 2021 On 2/27/2021 at 6:08 AM, Synthpopalooza said: Final .xex for E.X.O. Area 5. Enjoy Great sounds! (but somewhat out of tune ?) Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted March 2, 2021 Author Share Posted March 2, 2021 (edited) I'm going to try a recording from real hardware tonight after work. Curious to see if it sounds radically different from emulation. Edited March 2, 2021 by Synthpopalooza Quote Link to comment Share on other sites More sharing options...
VinsCool Posted March 2, 2021 Share Posted March 2, 2021 Just for fun I recorded a few executables I had around since I was playing around on my machine for some other tests and recordings Those were recorded off a NTSC 800xl. This sounds pretty damn cool! Exo Area1.ogg Exo Area5.ogg Exo Title.ogg 5 1 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted March 2, 2021 Author Share Posted March 2, 2021 So some explanations: On Area 5 music, the setup is SKCTL two-tone, 1.79 plus 15 khz. The frequency carrier is the second channel, and it takes values from the 15khz $Ax distortion table. The modulation in first channel puts it into a saw wave which transposes it up an octave from the standard 15khz mode. This means that the high part of the arpeggio may be a bit out of tune. The delay echo effect is from using a higher modulation of that same saw wave, but a smaller frequency value decreases the apparent volume. 1 Quote Link to comment Share on other sites More sharing options...
emkay Posted March 2, 2021 Share Posted March 2, 2021 14 hours ago, VinsCool said: Just for fun I recorded a few executables I had around since I was playing around on my machine for some other tests and recordings Those were recorded off a NTSC 800xl. This sounds pretty damn cool! Exo Area1.ogg Exo Area5.ogg Exo Title.ogg Thanks for the recordings. They really show that POKEY sounds better than the emulations. It's just that those high sounds have a lot more power than the low sounds. It's how Pokey generates the waves (density of voltage switches). A little less volume on the high sounds really would be great. Particular the gen 2 sound. 1 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted March 8, 2021 Author Share Posted March 8, 2021 (edited) Still busy. Latest task: Documenting the AUDCTL=$40 SKCTL=$8B two tone mode using $4x distortion in the first channel, and $Cx frequencies in the second. This mode is complex because it is subject to all the quirks of polycounter behavior: Specifically, frequencies are dependent on the prime numbers of 3, 5, and 31. One of the first discoveries I made is that if you place a mod 15 (divisible by 15) setting in the first channel, you get the standard $Cx distortion using those frequencies in the second channel, but as the modulation increases in the first channel, a fuzzbox distortion effect is introduced. Another discovery: Using the other mod 5 settings in the first channel, gets you several distinct electric guitar timbres, tuned to the $Cx mod 3 settings. I have a partial table here. Note that the $Cx frequencies have to be varied occasionally, and in some cases you have a range that can be played. More work remains ... several other combinations and note tables are possible. There is also a setting using mod 31 frequencies that makes eerie alien sounds. AUDCTL40_SKCTL8B_AUDC14x_table_2.0.txt Edited March 8, 2021 by Synthpopalooza 3 1 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted March 12, 2021 Author Share Posted March 12, 2021 Also ... Thanks to some suggestions, I made another discovery ... When using reverse 16-bit mode, in some cases playing both channels will add harmonics to your notes. This method works with A and C distortions at 64khz ... And also 2, 4, and 8 poly9 as well at 1.79 mhz. Will experiment with these soon. 1 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted March 16, 2021 Author Share Posted March 16, 2021 A partial documentation of $4x $Cx SKCTL has been finished. First table: AUDF1=mod 15. AUDF2=standard C distortion. As AUDF1 increases, a fuzzbox distortion effect is introduced. The second category is for AUDF1=mod 5 values. There are four subcatgories: * AUDF2 roughly equals values from distortion C mod 3 (RMT C) * AUDF2 roughly equals values from distortion C non mod 3 (RMT E) * miscellaneous frequencies * AUDF2= 0 to 11, which produce solid tones only (not yet finished) Still to do: AUDF1=mod 3 AUDF1=non mod 3 AUDF2=mod 5 (all AUDF1 instances ... more guitars) AUDF2=mod 31 (which mainly produce only C# notes, but a wide variety of timbres!) AUDF1=mod 31 (alien heartbeat sounds) More soon! AUDCTL=$40, SKCTL=$8B AUDC1=$4x table 2.0.txt 3 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted April 12, 2021 Author Share Posted April 12, 2021 Just an update: Working my way through mod 3 ... we are getting guitars here with a tuning range up into the 5th octave. So there are three subtables: mod 3/mod 3 mod 3/mod 5 mod 3/no mod Each has different behaviours. 2 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted April 26, 2021 Author Share Posted April 26, 2021 The latest: Area 2 music from the upcoming EXO game on the 7800. Setup is: AUDCTL=$60 (1.79 mhz on first and third channels) SKCTL=$8B (two-tone mode) 00 - $4x @1.79 mhz ... frequency modulation 01 - $Cx distortion ... frequency carrier for 00 02 - $Cx @1.79 mhz ... high saw lead 03 - $Ax standard square wave ... arpeggios This uses the SKCTL mode I was trying to document above. In this case, we use frequencies divisible by 5 in the first channel, when paired with frequencies from the standard $Cx table in the second channel, guitar modulations are made. When a frequency divisible by 15 gets used in the first channel, the effect is a fuzzbox-distorted C distortion. Playing the carrier frequency in distortion C on the second channel thickens out the sound. Playing distortion C on the second channel only works when using mod 5's or mod 15's in the first channel. Other combinations (mod 3's or non mod's in first channel) won't work with C distortion in channel 2. exo-area2.s exo-area2.xex exo-area5.asm 4 Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted April 27, 2021 Share Posted April 27, 2021 (edited) deleted. Edited April 27, 2021 by Kyle22 Quote Link to comment Share on other sites More sharing options...
rensoup Posted April 27, 2021 Share Posted April 27, 2021 8 hours ago, Synthpopalooza said: The latest: Area 2 music from the upcoming EXO game on the 7800. Seems impossible to download the file... not sure if there's a problem with AA whenever there are audio files on the page ? Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted April 27, 2021 Author Share Posted April 27, 2021 AA is mrssing up. It's just an .xex plus sources. ? ... no idea why Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted April 27, 2021 Author Share Posted April 27, 2021 (edited) del ... dupe post Edited April 27, 2021 by Synthpopalooza Quote Link to comment Share on other sites More sharing options...
rensoup Posted April 27, 2021 Share Posted April 27, 2021 8 hours ago, Synthpopalooza said: AA is mrssing up. It's just an .xex plus sources. ? ... no idea why I meant mp3(?) files that Vinscool posted earlier, could be a coincidence but whenever there are audio files in a thread, loading issues crop up. Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted April 27, 2021 Author Share Posted April 27, 2021 ahh yes those ... good to know for next time. Quote Link to comment Share on other sites More sharing options...
Mathy Posted April 27, 2021 Share Posted April 27, 2021 Hello guys The xex-file downloaded just fine here. Sincerely Mathy Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted April 27, 2021 Author Share Posted April 27, 2021 Next up: SKCTL $4x distortion, 1.79+15khz. Some of the same qualities as above, but you get to use 15khz, if you wanted distortion A bass on another channel. Demo soon. Quote Link to comment Share on other sites More sharing options...
rensoup Posted April 30, 2021 Share Posted April 30, 2021 Well I was never able to download those files, instead of showing the download count, they're now in a permanent "fetching info" state 1 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted May 1, 2021 Author Share Posted May 1, 2021 Just sent you a PM with the files again ... give it another try 1 Quote Link to comment Share on other sites More sharing options...
rensoup Posted May 3, 2021 Share Posted May 3, 2021 On 5/1/2021 at 4:57 AM, Synthpopalooza said: Just sent you a PM with the files again ... give it another try I had to LZSS it! works pretty nicely with custom SKCTL... (DOH can't even attach files either in this thread...) Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted May 15, 2021 Author Share Posted May 15, 2021 So as an update: Working my way through SKCTL $4x distortion, 1.79+15 ... discoveries so far: AUDF1=mod 15 gets you the $Cx bass in 15 khz, with fuzziness added the greater AUDF1 is AUDF1 mod 31 gets those alien sounds again Others get you varying guitar timbres. Each AUDF1 setting has a unique note table and timbre, which opens up the possibility of dozens of note tables. 4 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted May 15, 2021 Author Share Posted May 15, 2021 (edited) Dupe post. Damn android phone ... Edited May 15, 2021 by Synthpopalooza Quote Link to comment Share on other sites More sharing options...
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