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STe audio (adding a stereo output)

General discussions or ideas about hardware.
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Cyprian
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Re: STe audio (adding a stereo output)

Post by Cyprian »

Pacman wrote: Fri May 30, 2025 8:41 pm LMC-1992 isn't really a mixer
yes, my fault, it's rather an amplifier with volume/panorama control and equalizer
Pacman wrote: Fri May 30, 2025 8:41 pm But it would be very helpful if someone could clear up the purpose of input 2 (-12dB) of the LMC-1992?
unfortunately STE has no YM -12dB. Atari planned to implement it, but eventually changed their mind. Why? We don't know.
Atari: V4sa TT030 Falcon030 Mega ST Mega STe 1040 STe 520 STm 800XL 65XE Jaguar Lynx I/II 7800 Portfolio / VME: ATW800/2 Mach64 Mach32 ET4000 CrazyDots PAMNet / SM146 SC1435 SM124 / Antonia2 ATSpeedC16 TF536 PAK68/3
Megafile30 Atari1050 DDDHDD XCA12 SF314 / AVGCART SUBCART SidecarTridge ACSI2STM FujiNet LynxMultiCard SkunkBoard CosmosEx SatanDisk UltraSatan USBFloppyDriveEmulator SDrive SIO2PC Eiffel
http://260ste.atari.org
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Pacman
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Re: STe audio (adding a stereo output)

Post by Pacman »

Cyprian wrote: Fri May 30, 2025 9:21 pm unfortunately STE has no YM -12dB. Atari planned to implement it, but eventually changed their mind. Why? We don't know.
Huh? Now you've got me confused :o
I thought the whole idea with the STe LMC mixer audio fix was because input 2 was supposed to be -12dB lower than input 1, but due to a hardware mistake in the design it instead resulted in complete silence from the YM-2149.
STe | MonSTer with dual IDE-CF memory card adapter | NEC Multisync 1990SXi | ST_ESSC | RSVE | Link '97 | Sony HD floppy drive/AJAX controller | Exxos HD floppy module | Battery-backed Ricoh realtime clock module | Discovery cartridge | C-Lab Unitor-2 | C-Lab Export | C-Lab Combiner | C-Lab Steady Eye | C-Lab Human Touch | Unicorn USB

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Cyprian
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Re: STe audio (adding a stereo output)

Post by Cyprian »

Pacman wrote: Fri May 30, 2025 9:40 pm
Cyprian wrote: Fri May 30, 2025 9:21 pm unfortunately STE has no YM -12dB. Atari planned to implement it, but eventually changed their mind. Why? We don't know.
Huh? Now you've got me confused :o
I thought the whole idea with the STe LMC mixer audio fix was because input 2 was supposed to be -12dB lower than input 1, but due to a hardware mistake in the design it instead resulted in complete silence from the YM-2149.
there is no magic here :)
As we checked on Atari-Forum.com, the standard STE has no "YM -12dB mixing" mode.
If you want, you can have this mode by modifying your STE with this "STE LMC MIXER AUDIO FIX".
Atari: V4sa TT030 Falcon030 Mega ST Mega STe 1040 STe 520 STm 800XL 65XE Jaguar Lynx I/II 7800 Portfolio / VME: ATW800/2 Mach64 Mach32 ET4000 CrazyDots PAMNet / SM146 SC1435 SM124 / Antonia2 ATSpeedC16 TF536 PAK68/3
Megafile30 Atari1050 DDDHDD XCA12 SF314 / AVGCART SUBCART SidecarTridge ACSI2STM FujiNet LynxMultiCard SkunkBoard CosmosEx SatanDisk UltraSatan USBFloppyDriveEmulator SDrive SIO2PC Eiffel
http://260ste.atari.org
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Pacman
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Re: STe audio (adding a stereo output)

Post by Pacman »

Cyprian wrote: Fri May 30, 2025 10:09 pm there is no magic here :)
As we checked on Atari-Forum.com, the standard STE has no "YM -12dB mixing" mode.
If you want, you can have this mode by modifying your STE with this "STE LMC MIXER AUDIO FIX".
I think I understand:
this "hardware bug" prevents the "-12dB" input from working as intended, so programmers can't use this feature in their software (if they wanted to make the (YM-2149 generated) background music lower than the DMA (sampled) sound effects), right?

But if enough Atari users do this modification, programmers can add this feature to their games.
This is what the "Randomazer -support for LMC mixer audio fix" page (and video) appears to explain.
Did I get it right?
STe | MonSTer with dual IDE-CF memory card adapter | NEC Multisync 1990SXi | ST_ESSC | RSVE | Link '97 | Sony HD floppy drive/AJAX controller | Exxos HD floppy module | Battery-backed Ricoh realtime clock module | Discovery cartridge | C-Lab Unitor-2 | C-Lab Export | C-Lab Combiner | C-Lab Steady Eye | C-Lab Human Touch | Unicorn USB

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