The official OS might do this too, but I have no way of writing a 720 kB disk at the moment and only the much more popular Typhoon 2000 OS. Most other users probably have that, anyway! So, the easiest way to replicate this – or not… – is and to follow the instructions in its manual PDF as follows: Load the OS. Press SYSTEM SETUP. Press UTILITY. Choose to Load the Setup 01: DEMO. Set PERFORMANCE SELECT to 01: MULTI. Now, follow their advice of trying out the Typhoon LPF by going to VOICE EDIT / voice 1: ANA_STRS / parameter 5: filter / table 17: LOWPASS. However, the official LPF at table 01 should also produce almost as noticeable results.
Now play any E note from MIDI channel 1 of your controller, thus playing the ANA_STRS voice. Do you hear repeated square-wave-y alterations in timbre, increasing and decreasing (not only pitch) high-frequency content – which almost sound like the filter being opened and closed periodically? I do! Yet there is no modulation programmed from any LFO to the cut-off frequency, and the same strange effect does not occur on any notes other than E There is, however, a modulation set from LFO to pitch, and if you really ramp up that PMD, D# and F notes start to be affected…
Having fooled around with various waveforms, filters, and modulations, I can only assume this pattern of sudden stepping between timbral variations is due to some strange interaction between—
- the filters and their quantisation to 10 steps on each axis and/or
- some sort of octave-based scaling for waveforms’ pitch, which results in particular notes becoming ‘transition points’ for timbral artefacts
but my aforementioned technical theories could be totally wrong, and maybe I just got unlucky with an isolated glitchy TX16W… hence this thread needing your feedback!
All feedback and testing is welcomed. I’m keen to know whether this is ‘normal’, a.k.a. just bad programming/design – or whether I have yet another ‘quirky’ module… There was, at least, a glimmer of hope on a page written by one of the regulars here, @madtheory: http://madtheory.com/site/?p=340
So, hopefully I can be reassured this is a usual thing – then I can get to making the most out of this daft old beast and its silly glitchiness.Other things were impossible to fix- the digital filters are still very limited, and
modulation can cause glitches with certain pitch and sample rate combinations.