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Emulating MT-32 on an RPi2

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Reply 240 of 242, by gdjacobs

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7F20 wrote on 2020-02-17, 00:20:
i haven't pursued that for a couple of reasons: […]
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digger wrote on 2020-02-17, 00:03:

Aren't there quite a few high quality sound cards for the Raspberry Pi out there that connect through GPIO pins as opposed to USB? Wouldn't that work even better?

i haven't pursued that for a couple of reasons:

1) I usually use the GPIO for a 24bit VGA adapter that hooks up to an old RGB monitor for arcade games

2) I'm not sure how well such a solution would work with Lakka (or if it would work at all)

3) Those solutions are a good deal more expensive than my $5 usb adapter from amazon.

4) They sound better, but the $5 one actually sounds pretty good.

however, it's an interesting idea that i may look into in the future. i have one setup that goes from the HDMI to a VGA adapter and out to a monitor, but there is a whole different set of problems with that setup. (mostly that lakka is incompatible with HDMI-VGA adapters)

1) Your VGA output will work with a DAC as long as there's no conflicting pin assignments. Lots of DACs can be fitted with a pass through I/O header.

2) DAC parameters are configured from the boot partition. Including the appropriate overlay files and adding the appropriate options to config.txt will get you up and running regardless of the distro you're on.

3) They are. I'd really like to see an inexpensive DAC that just does CD quality output.

4) I agree.

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Reply 242 of 242, by gdjacobs

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squeeb wrote on 2020-02-19, 21:37:

Thoughts on using this in conjunction with the Pisound board for MIDI IN/OUT?

I haven't used the Pisound, but it does appear to require a kernel module for the MIDI interface. That module isn't included in the kernel upstream source and therefore likely not in the Debian kernel packages. You can either build the module yourself or discard ARMv8 and go with Raspbian to resolve the issue as the official Raspberry Pi tree includes some of the Pisound code and the Pisound devs provide armhf binaries in their repo.

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