Search found 92 matches

by joeboy
Tue Feb 19, 2019 5:35 am
Forum: General Synthesizers
Topic: Non-ideal square waves
Replies: 6
Views: 2740

Non-ideal square waves

To implement square waves, I'm using a wavetable that literally jumps between -1.0 and 1.0. I know this isn't how squares work in the physical world, and it certainly doesn't sound very good. I'm wondering how un-ideal the typical square wave is in an analog synth. I know you can approach a square b...
by joeboy
Tue Jan 29, 2019 5:41 am
Forum: General Synthesizers
Topic: Still possible to get a Juno 60 for a good deal?
Replies: 24
Views: 10418

Re: Still possible to get a Juno 60 for a good deal?

I've seen them going for 400-500 USD in Japan.
Having yet another analog poly always seemed redundant to me, but if I knew the markup was that insane in other countries, I'd get a little hustle going.
by joeboy
Fri Dec 29, 2017 7:46 am
Forum: General Synthesizers
Topic: Are software synths disposable instruments?
Replies: 19
Views: 4812

Re: Are software synths disposable instruments?

I saw an interview with Steve Albini and this precise concern seemed to be the root of his analog fundamentalism, as opposed to concerns over audio itself.
by joeboy
Fri Dec 29, 2017 7:25 am
Forum: General Synthesizers
Topic: Refining a modulation algorithm
Replies: 1
Views: 482

Re: Refining a modulation algorithm

Sorry for bumping my own thread, but I thought it might be worthwhile to throw in additional observations since people sometimes find this board through search engines. I've done more experimenting, and the algorithm I've described indeed modulates pitch periodically. There needs to be an additional...
by joeboy
Mon Dec 18, 2017 10:19 am
Forum: General Synthesizers
Topic: Refining a modulation algorithm
Replies: 1
Views: 482

Refining a modulation algorithm

Hello comrades, I'm back with another general synthesis question. I'm not asking to be spoonfed, but any knowledge/suggested reading material that will nudge me in the right direction is greatly appreciated. At the moment I'm using wavetables with linear interpolation to represent oscillators, and e...
by joeboy
Fri Nov 03, 2017 12:57 pm
Forum: General Synthesizers
Topic: Oscillators always oscillate?
Replies: 10
Views: 1301

Re: Oscillators always oscillate?

Thanks for the answers. I have a much clearer idea of where to go in my programming now. I already have a variable that increments for every sample-writing cycle and "timestamps" a given component with the last cycle it was active, so it should be easy to calculate the phase of waves without actuall...
by joeboy
Fri Nov 03, 2017 10:31 am
Forum: General Synthesizers
Topic: Oscillators always oscillate?
Replies: 10
Views: 1301

Re: Oscillators always oscillate?

Sorry, I meant "what frequency is a VCO oscillating at before any key is pressed and a sample and hold circuit locks it into the last played pitch's frequency?" I'm guessing something like this varies between hardware, but is it generally higher/lower than the keys' pitches? Also, when simulating a ...
by joeboy
Fri Nov 03, 2017 8:09 am
Forum: General Synthesizers
Topic: Oscillators always oscillate?
Replies: 10
Views: 1301

Re: Oscillators always oscillate?

That's pretty cool. What's the oscillator doing before any keys are pressed though?
by joeboy
Fri Nov 03, 2017 6:14 am
Forum: General Synthesizers
Topic: Oscillators always oscillate?
Replies: 10
Views: 1301

Oscillators always oscillate?

So I know lots of LFOs are free running, where they are always cycling through their waveform regardless of whether or not a note is being played. This behavior is easy to observe since the F of the O is so L, and the frequency is usually independent of any pitch that is played. I think I've read be...
by joeboy
Sun Oct 22, 2017 6:50 am
Forum: Sound Production
Topic: Dithering and silence
Replies: 7
Views: 3270

Re: Dithering and silence

Well I'm a remarkably stupid person sometimes. It seems that somewhere in the header file, the buffer that writes each byte to the soundcard was inadvertently changed from type uint8_t to uint32_t. Can't believe that slipped past me. For whatever reason, storing a near-silent 1 byte amplitude value ...
by joeboy
Sat Oct 21, 2017 4:24 pm
Forum: Sound Production
Topic: Dithering and silence
Replies: 7
Views: 3270

Re: Dithering and silence

Thanks for the reply. It's good to know that my stopgap measure of returning a straight 0 is ok. But you're right; I shouldn't be able to hear the dither noise anyway. I put some printfs in the function and it looks like for inputs of 0.0, the final dithered int sometimes wraps around to the neighbo...
by joeboy
Sat Oct 21, 2017 7:16 am
Forum: Sound Production
Topic: Dithering and silence
Replies: 7
Views: 3270

Dithering and silence

So I'm on/off writing an audio program in C, just for learning's sake. All internal sound values are 32 bit floats, but they are converted to 16 bit integers before being written to the sound card. I've been told that I need to dither so that I may avoid distortion caused by rounding errors. I've us...
by joeboy
Mon Jan 30, 2017 1:11 pm
Forum: General Synthesizers
Topic: EDIT* thoughts on AKAI 60
Replies: 19
Views: 1873

Re: EDIT* thoughts on AKAI 60

I kinda regret getting an AX-80 over a 60. At the time they were both floating around 400 USD and figured the one with more oscillators would automatically be better, not realizing the 60 is a whole lot more interesting.

Now I see them listed for considerably more. I blame OPN.
by joeboy
Sat Dec 24, 2016 10:20 am
Forum: Samplers
Topic: How were one-shot samples traditionally pitched?
Replies: 6
Views: 2114

Re: How were one-shot samples traditionally pitched?

Thanks for the info. I imagine I'll get into filters soon enough as I'm planning on doing lots of audio programming over the break, but I've found out why my pitch-shifting was so noisy: a sign error! The PCM should have been read, manipulated, and written as signed rather than unsigned. So I'm afra...
by joeboy
Sat Dec 24, 2016 9:35 am
Forum: Samplers
Topic: How were one-shot samples traditionally pitched?
Replies: 6
Views: 2114

Re: How were one-shot samples traditionally pitched?

I wasn't aware of that. I'm kind of stumbling through all this blindly. Maybe that's the next direction I should head in, thanks.