[sdiy] Trueno

rburnett at richieburnett.co.uk rburnett at richieburnett.co.uk
Tue Dec 12 15:02:28 CET 2017

Yep, not nice (>.<)  It looks like they didn't use any sort of 
anti-aliasing filter before digitising the analogue output.  Any 
half-decent VA synth would certainly do better than this.  The linear 
decay envelope sounds a bit unusual too.

One of the Trueno reviews I read seemed to suggest that it "threw away 
the best features of analogue and digital synths, and kept the worst 
bits."  At least if they'd included an analogue output jack then you 
could have avoided the poor quality audio digitisation.


On 2017-12-12 13:34, Vladimir Pantelic wrote:
> Trueno has some raw waveform samples on their website and at first
> glance, they have quite a bit of aliasing present. not as bad as a 
> naive
> digital waveform, but not as clean as one would expect from a correctly
> sampled analog VCO either...
> e.g. 
> http://truenosynth.com/wp-content/uploads/2017/mp3/Osc%20-%20Saw.mp3
> On 12.12.2017 10:57, Roman Sowa wrote:
>> The list is a bit too quiet recently, so maybe instead of regular "is
>> this thing on?", here's something to discuss and threading endless
>> suppositions about what's in there and what's not.
>> One of my fb friends has just bought the Trueno synthesizer and by my
>> polite request, he made a photo of inards at better angle than the one
>> on maker's website. Photo of the other side tomorrow - he says.
>> http://www.synthdiy.eu/files/trueno.jpg
>> My first thought when I saw it was ASM-1 or MFOS, but that's probably
>> just because of generous amount of TL074. Plus 3x 4051 mux.
>> Obviously on the other side will be some ARM or whatever to deal with
>> USB, ADC and control voltages, DC/DC converters, and something tunable
>> for the filter (OTA, or transistors), because it's only one 074 
>> outlined
>> there as VCF with only few passive components.
>> Roman
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