Search found 55 matches

by DesolationBlvd
Wed Oct 14, 2020 11:06 am
Forum: General Gear
Topic: Oberheim ob8 Arpeggiator only sounds 6 different notes
Replies: 5
Views: 199

Re: Oberheim ob8 Arpeggiator only sounds 6 different notes

If it's the listing I'm thinking of, that unit is a factory MIDI / page 2 graphics unit, so it'll have the Panasonic keybed.
by DesolationBlvd
Sat Oct 10, 2020 11:08 pm
Forum: General Gear
Topic: What is the worst synth sounding you ever bought and why ?
Replies: 473
Views: 59495

Re: What is the worst synth sounding you ever bought and why ?

Any of the “synth on a chip” CEM3396 / PA397 based synth have always sounded really disappointing to me and I tried a bunch. My list: Six Track, Mopho, Prophet 08, Evolver (had 3 times). The Six Track sounded bland and muddy, the DSI instruments sounded bland and fizzy. I have not owned a Matrix 10...
by DesolationBlvd
Wed Sep 30, 2020 3:15 pm
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

On my JP-8, the saws on the odd numbered voices are slightly flat compared to the pulses, and this is both before and after auto-tune. The auto-tune seems to work fine for the pulse. And the even numbered saws match their pulse outputs? -------- Glad i asked. Like Don T, I thought we were talking a...
by DesolationBlvd
Sun Sep 27, 2020 4:55 pm
Forum: Music Tech DIY
Topic: Yamaha SY99 "Change Wave Bat" (though the battery was fine before)
Replies: 2
Views: 86

Re: Yamaha SY99 "Change Wave Bat" (though the battery was fine before)

The reason I don't think it's really the batteries is because I found out my unit had two SYEMB05 cards and they were also mentioned in the Change Wave Bat message at the same time. This is where I found the reseating the CPU answer to the wave bat message: https://yamahamusicians.com/forum/viewtopi...
by DesolationBlvd
Sat Sep 26, 2020 10:28 pm
Forum: Music Tech DIY
Topic: Yamaha SY99 "Change Wave Bat" (though the battery was fine before)
Replies: 2
Views: 86

Yamaha SY99 "Change Wave Bat" (though the battery was fine before)

I successfully fixed the dead floppy and fading backlight on my Yamaha SY99. But since putting it back together the first time, I get "Change Wave Bat". I did not get this before I serviced the unit. Tried reseating cables, no dice. I searched online and saw someone else who fixed it by removing the...
by DesolationBlvd
Wed Sep 23, 2020 10:04 am
Forum: General Gear
Topic: What new booty did you buy?
Replies: 7515
Views: 619617

Re: What new booty did you buy?

Picked up a Yamaha SY99. It's replacing my TX7, and threatening my D-550's role of "late eighties / early nineties choirs with sparkly bells". Also ordered an Eventide DSP4000, with maxed out memory and the guitar and broadcast preset cards to give the presets otherwise exclusive to the GTR4000 and ...
by DesolationBlvd
Sat Sep 12, 2020 6:14 pm
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

Since the thread has actually two different reports, can you clarify which exactly is your current problem? Does it go flatter after auto-tune on the single VCO of a board pair where the 2nd VCO tunes fine? Are Saw and Pulse always different? Or only after auto-tune? On my JP-8, the saws on the odd...
by DesolationBlvd
Sat Sep 12, 2020 9:17 am
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

I'm actually stumped on the +10 / -5 adjustment. I followed the source to the mod-con, but there isn't a trimmer like for the 13.

Mine measures 11.35 at C61 and -6.1 at C62. (11.3, -6.13 on the lower board)
by DesolationBlvd
Fri Sep 11, 2020 8:37 pm
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

Revisiting the JP-8, of note is that my +10V and -5V on the voice cards is closer to +12 and -6V respectively.

I tried to look for a rogue signal modulating the pulse width on VCO1 to create the bleed, but couldn't find it.
by DesolationBlvd
Sat Aug 29, 2020 6:14 pm
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

Yep, just the second edition which is missing the first edition's Theory of Operation. I think that might be very helpful to me, seeing as I used the Theory of Operation from the DMX service manual to fix its hi-hat not properly closing. Here's another clip. The bleeding responds to the pitch of VCO...
by DesolationBlvd
Sat Aug 29, 2020 3:01 pm
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

Probed the pins on the 3046, switching between saw and pulse on VCO1. The voltage did not change. I have attached a clip, each time rotating through the eight voices. First is VCO1 and pulse only. There seems to be a weird bleed on the odd numbered voices. There is no bleed if set to triangle, saw, ...
by DesolationBlvd
Thu Aug 27, 2020 7:38 pm
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

Looked at the output of pin 6 on IC 3A, and switching between waveforms had no effect. Ok, scope or DMM, Probe pins 8, 9, and 11 of the 3046, and repeat same test for each pin, looking for any changes from saw to square. Also, not sure if you have seen this site, but it may be useful: https://jup8r...
by DesolationBlvd
Wed Aug 26, 2020 10:49 pm
Forum: General Gear
Topic: Favorite 80s rack mount digital reverb?
Replies: 126
Views: 3611

Re: Favorite 80s rack mount digital reverb?

I've now got a Sony MU-R201 on the way. Is that a step in the right or wrong direction from the Quadraverb? Mainly, I was drawn to the low used price and true stereo. I've heard it has a more natural, if darker, sound than most Eighties reverb units. Hopefully said natural character would be good fo...
by DesolationBlvd
Tue Aug 25, 2020 11:58 am
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

Looked at the output of pin 6 on IC 3A, and switching between waveforms had no effect.
by DesolationBlvd
Mon Aug 24, 2020 5:42 pm
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

I took a closer look, and they were actually roughly in phase.
IMG_0349[1].JPG
IMG_0350[1].JPG
by DesolationBlvd
Wed Aug 19, 2020 8:47 pm
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

the reason i ask, is because the square is derived from the saw, so if they simultaneously sound off, then perhaps its a perceptual thing. the presence of higher harmonics changes the percieved fundamental. if you look at them simultaneously on your scope, are they locked to one another? What I mea...
by DesolationBlvd
Wed Aug 19, 2020 3:11 pm
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

I used a tuner to play the 220/440/880 Hz test tones I tuned the square to (so I could determine that the saw was flat in comparison). I haven't compared the triangle.

I'll have to test the squares again, this time with the filter wide open.
by DesolationBlvd
Wed Aug 19, 2020 7:06 am
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

Probing at the inputs of IC7, the waveform selector, it does look like the saw is still flat (or rather, the square is still sharp compared to saw), regardless of what the selector is set to. At the very least, the pitch of the incoming waves is not affected to my eyes on the scope.
by DesolationBlvd
Tue Aug 18, 2020 9:31 pm
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

if its only going off at high notes, have you tried adjusting the VCO linearity trim? I tested again tonight. The oscillator is in tune at 220, 440, and 880 Hz when set to square, and is consistently flat at those same pitches when set to saw - the speed of the beating at each pitch seems to sugges...
by DesolationBlvd
Tue Aug 18, 2020 7:14 am
Forum: Music Tech DIY
Topic: Roland Jupiter 8 VCO1 drift
Replies: 43
Views: 1416

Re: Roland Jupiter 8 VCO1 drift

Sorry to bump and double-post, but I just found another insight on my tuning issues. The bum oscillator is much closer to in-tune when it is set to pulse/square than when it is set to saw. I confirmed the tuning by using the master tune to get it dead-on with the square, and then switching it to saw...
by DesolationBlvd
Thu Aug 13, 2020 12:57 pm
Forum: General Gear
Topic: Roland Boutique Price Jump
Replies: 39
Views: 1704

Re: Roland Boutique Price Jump

I wanted a D-05, but by the time I got around to it, a D-550 was actually cheaper. Unfortunately, since the D-550 takes up rack space and the D-05 wouldn't have.
by DesolationBlvd
Wed Aug 12, 2020 3:44 pm
Forum: General Gear
Topic: Favorite 80s rack mount digital reverb?
Replies: 126
Views: 3611

Re: Favorite 80s rack mount digital reverb?

I'm now also looking at the OTO BAM. Current production and not a rack, but it's supposed to capture the Eighties reverb sound. But I see a Lexicon PCM80 for less than a new BAM.
by DesolationBlvd
Wed Aug 12, 2020 2:54 pm
Forum: General Gear
Topic: Favorite 80s rack mount digital reverb?
Replies: 126
Views: 3611

Re: Favorite 80s rack mount digital reverb?

continuum wrote:
Wed Aug 12, 2020 2:08 pm
DesolationBlvd wrote:
Wed Aug 12, 2020 12:19 pm
At the risk of sounding like an idiot, how am I supposed to use a mono-in reverb with stereo effects?
Use an Aux send from a mixer. Studio rack units are rarely used in series.
...yeah, for all the stuff I have, a mixer isn't one. I just go straight into my interface.
by DesolationBlvd
Wed Aug 12, 2020 12:19 pm
Forum: General Gear
Topic: Favorite 80s rack mount digital reverb?
Replies: 126
Views: 3611

Re: Favorite 80s rack mount digital reverb?

I guess I'm hung up on stereo in, because I want to preserve the stereo that my other effects introduce. But I looked up another one of the "classic" Eighties reverb units, the AMS RMX16, and it was mono in. But that one seems to be most famous for snares, which don't need stereo anyway. At the risk...
by DesolationBlvd
Tue Aug 11, 2020 3:30 pm
Forum: General Gear
Topic: Favorite 80s rack mount digital reverb?
Replies: 126
Views: 3611

Re: Favorite 80s rack mount digital reverb?

Is it OK if I hijack this? I've got a Quadraverb and am looking for an upgrade - the "next step up" while still having an Eighties character. Budget is less of a concern than it is for the OP. Stereo input is a must (I had to rule out Lexicon PCM 70 because of only mono input). Lexicon PCM 80/81/90/...

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