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Knungle

By Wisefire on April 7, 2024 11:45 pm

Knudde Jungle.

Playing around with the new AMIGO plugin, a AMIGA style sampler with some neat tricks up it sleeve.

Audio works licensed by author under:
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A fun short tune, I dig the trance gating. Takes me back!

Apparently, Pete Cannon likes the AMIGO sampler so there's that. Personally, I wasn't that impressed by it because the plugin misses some crucial details that make actual Amigas much more hi-fi sounding than what AMIGO produces. But I guess that would be boring to admit for a coloring sampler.

ECS and AGA Amigas could output 28 kHz sound. AMIGO goes to 22 kHz. More importantly, outputting 8-bit samples directly on the 8-bit Paula audio chip didn't require interpolation as playing 8-bit samples on 16-bit or 24-bit audio interfaces does. You go straight to the DAC, which produces less distorted signal that way, both because of the higher volume (a side-effect of interpolation is a quieter signal) and due to the pleasantly nonlinear R-2R DAC circuitry. One funny thing the original DAC does is that it control output volume by pulsating shorter when quieter volume was chosen in software. That influences how higher frequencies sound at lower volumes. Finally, all Amiga chipsets have a low-pass filter after the DAC but their configuration differs between chipset models, so I'd expect that AMIGO should let you choose which behavior you want. AFAICT it doesn't implement any of the things I mentioned.

Source: back in the day I had an Amiga 600 that I used for tracking with OctaMED 5 and ProTracker 2 before that.

Haha, sorry for the rant big_smile

rplktr wrote:

A fun short tune, I dig the trance gating. Takes me back!

Apparently, Pete Cannon likes the AMIGO sampler so there's that. Personally, I wasn't that impressed by it because the plugin misses some crucial details that make actual Amigas much more hi-fi sounding than what AMIGO produces. But I guess that would be boring to admit for a coloring sampler.

ECS and AGA Amigas could output 28 kHz sound. AMIGO goes to 22 kHz. More importantly, outputting 8-bit samples directly on the 8-bit Paula audio chip didn't require interpolation as playing 8-bit samples on 16-bit or 24-bit audio interfaces does. You go straight to the DAC, which produces less distorted signal that way, both because of the higher volume (a side-effect of interpolation is a quieter signal) and due to the pleasantly nonlinear R-2R DAC circuitry. One funny thing the original DAC does is that it control output volume by pulsating shorter when quieter volume was chosen in software. That influences how higher frequencies sound at lower volumes. Finally, all Amiga chipsets have a low-pass filter after the DAC but their configuration differs between chipset models, so I'd expect that AMIGO should let you choose which behavior you want. AFAICT it doesn't implement any of the things I mentioned.

Source: back in the day I had an Amiga 600 that I used for tracking with OctaMED 5 and ProTracker 2 before that.

Haha, sorry for the rant big_smile


Yes a rant, but a really informative one! So i really appreciate you taking the time to explain. I've never used an Amiga myself, so it's quite unfamiliar territory to me. I did listen to mod files on repeat in my youth, without knowing where or how they were made. then someone introduced me to Fasttracker, and the rest is history. big_smile

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