Synth Tech e520 Hyperion Stereo Audio Processor

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studio460
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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by studio460 » Sat Apr 03, 2021 6:24 pm

New E520 Spectral Time Machine demo!

Again, this is a Siri text-to-speech passage taken from Ready.gov, sourced from an iMac using a Komplete Audio 6 interface-output directly into the left-channel input on the E520. [Note: "clicking" is NOT from E520.] This time the recording is made with all feedback settings at zero. Again, phase-vocoding artifacts aren't noticeable until about 0.07x-speed playback. Playback goes from 1.0x-speed to 0.01-x speed (extended 0.01x-speed playback begins at 01:30):



Both time-stretch fidelity and noise-floor is excellent. About the "click-click" sound: I have to re-do this recording since Logic's metronome was somehow turned to "on during recording" which shouldn't even be a setting.
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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by klstay » Sat Apr 03, 2021 6:50 pm

studio460 wrote:
Sat Apr 03, 2021 5:33 pm
I'M AN IDIOT!

Problem solved. It was all user-error. The left and right feedback pots were midway through this entire episode (I didn't realize there were three feedback pots). I will clean up the prior posts to erase any negative reflection on the E520.
Similar experience for me first days with the unit. I mostly use it patched in a send/receive FX loop on a Focusrite interface.

When sending mono unplug the right input. :doh:

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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by studio460 » Sat Apr 03, 2021 6:57 pm

klstay wrote:
Sat Apr 03, 2021 6:50 pm
Similar experience for me first days with the unit . . .
Thanks! At least I don't feel like I'm the only one, but boy do I feel dumb! Sorry, Paul, and thanks for all your replies! Anyhow, I have the recording-levels correct now in the above demo (a previous post had them too hot).
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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by studio460 » Sat Apr 03, 2021 7:55 pm

I think these examples show some of the weaknesses of phase-vocoder based time-stretching. Phase-vocoding is extremely well suited to vocal samples (as posted above). However, the recorded events below seem like they would benefit better from granular-synthesis based time-stretching. Neither algorithm is "better;" it largely depends on the type of source-material used.



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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by klstay » Sat Apr 03, 2021 8:48 pm

I feel kind of the same way which is why an ADDAC 112 may someday sit near the E520.

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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by studio460 » Sat Apr 03, 2021 9:04 pm

klstay wrote:
Sat Apr 03, 2021 8:48 pm
I feel kind of the same way which is why an ADDAC 112 may someday sit near the E520.
Sounds like a plan! I may join you in that. Edit: I took a closer look at the ADDAC manual. Apparently that's not really the tool for me either. I need a more focused granular sampler (i.e., less emphasis on slicing/overdubbing; more sample-playback focused). Neither the Instruo either, it seems. I think I'm just gonna wait it out for the Mordax GXN.
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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by studio460 » Sat Apr 03, 2021 9:18 pm





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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by studio460 » Mon Apr 05, 2021 10:03 pm

New E520 Spectral Time Machine time-stretch demo: Amazon Polly, AWS' NTTS (neural text-to-speech) voice, "Salli," is the source-audio (macOS-playback). Playback goes from 1.0x-speed to 0.01x-speed—no external effects have been used. All feedback pots are set at zero (full-CCW). [Correction: Zero-feedback would be at 12:00 o'clock, not full-CCW.] Quantization is turned off for both recording and playback. Artifacts aren't audible until about 0.12x-speed and lower.

Not sure why the "reverb-effect" seems less apparent on my previous demo above (using Apple's Siri) which appeared to record/playback with greater fidelity (despite Logic's metronome-clicks which I inadvertently recorded).

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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by Multi Grooves » Tue Apr 06, 2021 10:11 am

studio460 wrote:
Sat Apr 03, 2021 6:24 pm
New E520 Spectral Time Machine demo!

Again, this is a Siri text-to-speech passage taken from Ready.gov, sourced from an iMac using a Komplete Audio 6 interface-output directly into the left-channel input on the E520. [Note: "clicking" is NOT from E520.] This time the recording is made with all feedback settings at zero. Again, phase-vocoding artifacts aren't noticeable until about 0.07x-speed playback. Playback goes from 1.0x-speed to 0.01-x speed (extended 0.01x-speed playback begins at 01:30):



Both time-stretch fidelity and noise-floor is excellent. About the "click-click" sound: I have to re-do this recording since Logic's metronome was somehow turned to "on during recording" which shouldn't even be a setting.
I quite like it. It sounds exactly like lone footsteps through a cavernous space..
...but Cynthia, my Daddy never had a heath kit..

FS: SSF Entity

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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by Daisuk » Thu Apr 08, 2021 12:43 am

studio460 wrote:
Mon Apr 05, 2021 10:03 pm
New E520 Spectral Time Machine time-stretch demo: Amazon Polly, AWS' NTTS (neural text-to-speech) voice, "Salli," is the source-audio (macOS-playback). Playback goes from 1.0x-speed to 0.01x-speed—no external effects have been used. All feedback pots are set at zero (full-CCW). Quantization is turned off for both recording and playback. Artifacts aren't audible until about 0.12x-speed and lower.

Not sure why the "reverb-effect" seems less apparent on my previous demo above (using Apple's Siri) which appeared to record/playback with greater fidelity (despite Logic's metronome-clicks which I inadvertently recorded).

Nice, thanks for posting. Sounds almost paulstretch-like from that demo, which is awesome. :)

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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by studio460 » Thu Apr 08, 2021 8:17 pm

Thanks for the kind words, both of you! I haven't demonstrated any of the E520's CV-modulating talents yet, so there's a lot more "stuff" it can do!

On recording: There's an odd anomaly I've noticed upon recording. With the level-pots fully "on" (full-CW), the level approaches (and eventually reaches) full-attenuation (i.e., no sound). At about 2:00 o'clock, the level is about "right." However, at about 10:00 o'clock, a feedback-ey sound begins to creep in—this during the record-pause state. The record-input sweet-spot appears to be somewhere between those two settings.

Essentially, these two pots appear to affect the overall recording fidelity (e.g., the difference between the Siri-recording and the Salli-recording), and if set too low can exacerbate the "reverb-effect" heard in the second demo. These seem to need to be set at approximately 2:00 o'clock. Need to to test this more.
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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by drxcm » Thu Apr 08, 2021 9:57 pm

studio460 wrote:
Mon Apr 05, 2021 10:03 pm
All feedback pots are set at zero (full-CCW).
:foul:

I think it is because you have negative feedback going.

Feedback at zero means the dedicated feedback knobs should be at 12 o'clock, not fully CCW.

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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by d2ba » Thu Apr 08, 2021 11:05 pm

Could e520 is the best effects module yet in eurorack?

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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by drxcm » Thu Apr 08, 2021 11:16 pm

d2ba wrote:
Thu Apr 08, 2021 11:05 pm
Could e520 is the best effects module yet in eurorack?
The concept of "best" module makes little sense to me. Best for what, best for who?

So many factors to consider, eg:
Versatility
Price/performance
HP and functional density
Sound quality
Modulation capabilities
etc

I think it's lacking some core functionality to take any lead position. Perhaps if a more varied collection of algorithms eventuates. But it does have some unique effects. Then again so do many modules, eg Rainmaker does something no other processor does, so does Magneto. No doubt it's big, expensive, and well built.

ER-301 probably has the best versatility out there, but it's unavailable right now. Never tried one though - the complexity and interface puts me off.

FXaidXL is certainly a leader in the pack these days. That thing packs a punch in a small affordable package.

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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by studio460 » Fri Apr 09, 2021 12:22 am

drxcm wrote:
Thu Apr 08, 2021 9:57 pm
studio460 wrote:
Mon Apr 05, 2021 10:03 pm
All feedback pots are set at zero (full-CCW).
:foul:

I think it is because you have negative feedback going.

Feedback at zero means the dedicated feedback knobs should be at 12 o'clock, not fully CCW.
Aha! Thank you! I'll check that out. Paul also mentioned this.
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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by studio460 » Fri Apr 09, 2021 12:32 am

Here's a frame-grab from my premiere video demo I'm shooting of the E520! I can't post it yet since I don't have a TRS-TRRS cable to record audio on my iPhone (I plan to buy new Super35-format mirrorless camera soon since my "real" cine-rig is too large). My micro-track dolly is backordered a few weeks, but soon, I'll be posting one of the few modular videos online with dolly shots! Woohoo!

Also plan on recording some actual vocal tracks from an actual human being! My best friend's daughter is musically-trained and very good. She has a great rock 'n' roll voice with a raspy kind of Courtney Love-vibe. I'll be excited to run her vocals though the E520's vocoders and time machine. Paul says we can chain two mono-effects now, so we'll try some of that as well.

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Re: Synth Tech e520 Hyperion Stereo Audio Processor

Post by Smapti » Fri Apr 09, 2021 8:35 am

d2ba wrote:
Thu Apr 08, 2021 11:05 pm
Could e520 is the best effects module yet in eurorack?
For me, yes, unquestionably. I love spectral/FFT effects and no other module even comes close in this regard.

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