<div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Fri, 22 Jun 2018 at 03:59, <<a href="mailto:rsdio@audiobanshee.com">rsdio@audiobanshee.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">1) Why do you think that starting from the midpoint will be any less of a discontinuity than starting from a peak?<br>
<br>
The discontinuity amplitude would be 6 dB less, on average, but it’s still a discontinuity that can vary from cycle to cycle (at least when modulating pitch of one VCO).<br></blockquote><div><br></div><div>Well, it is less then. ;-)</div><div><br></div><div>I was keeping the questions a bit open, but I'm also aiming for the other even more important application of sync: Restarting oscillators at note-on. When you make drum synthesis, FM synthesis or even some regular bass sounds, it's often important that the oscillator(s) behaves identically each time the sound is started. (Note that this is with un-synced, free-running oscillators after the start sync pulse.)</div><div><br></div><div>Starting from silence, then starting playing a sound with short attack, using triangle or sine wave, it's definitely not desirable to start with a discontinuity to the peak of the wave. You need a way to start the tri/sin at the zero crossing.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">2) Are you looking to create vintage sounds or new and unique sounds?<br>
<br>
If you’re shooting for vintage, then the circuit design perspective will cover the most cases.<br>
If you’re looking for new and unique sounds, then I say that it doesn’t matter what the general consensus might be - just offer options between simple circuits and more complex circuits so that more sonic variation is possible.<br></blockquote><div><br></div><div>I'm looking to create all sounds. :-) Percussive sounds, drum sounds, synth sounds of old and new. I'm personally not a huge fan of classic sync leads and similar, but I still consider sync an important feature - both between oscillators and at the start of a sound. And since I consider it important to sync a triangle at its zero crossing, where the sawtooth wave normally is between its peak and its zero crossing, I'm wondering how important the sync start point of the sawtooth wave is in people's opinions.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">3) Of the three standard waveforms - square, saw, triangle - two of them have significant discontinuities. Triangle is the exception. It seems to me that discontinuities in the triangle waveform when using sync will simply put the triangle back into the majority category.<br></blockquote><div><br></div><div>Yes, and that kind of makes it lose its potential of being the mellow one of the standard waveforms.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">For me, the best part of turning on hard sync is the harsh and rich harmonic content. The whole point of subtractive synthesis is to start with a lot of harmonics and then get creative about filtering those harmonics.<br>p.s. I’ve never really seen a clear definition of what “soft sync” really means. Could your midpoint triangle sync fall into the soft category while peak triangle sync would fall into the hard category?<br></blockquote><div><br></div><div>No, soft sync is when you only perform the sync reset under certain circumstances, normally when the master oscillator has passed, say, 90 % of its period. Then the synced waveform can have a lower frequency than the master, and lock on to subharmonics (integer frequency divisions) of it.</div><div><br></div><div>/mr</div><div><br></div></div></div>