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General Discussion / YAQAMACh34 - Yet another question about Midi (and channel 34)
« Last post by SuNo-san on April 27, 2022, 09:56:14 AM »
I could finally find use my Minilab MKII (no 5-pin midi output) and Ableton plus a legacy midi-usb cable to test Channel 34 - works well, you can add that to the list.

1. I have the same issue as jluc in http://gechologic.com/support/index.php?topic=175.0 - I would plead for relative by default (suggestion for next release).

2. While playing around with Channel 34, I noticed that the key were having an effect : the "keyboard leds" on the LoopSynth shows correctly which key is pressed, and mostly the sound/processing that outputs from the channel is very different. For the sake of completion, Line input only, some sort of gate effect (on-sustain-off) can be heard, with a slight pitch change related to the key press, as expected. Could you tell us what exactly is the effect (nothing in the doc).

3. I tried playing the Minilab on various other channels ; it is somehow recognised by Channel 33, 34, 42, and maybe others.

4. Finally, I believe that an up-to-date MIDI section in the manual would help. Not talking about a long term wish: midi for controlling buttons B1-B4.
Rationales : 
  • Many midi controllers have a 4x4 pads ; two rows could be dedicated to the short and long presses of buttons. I don't know enough about midi implementation by vendors, but would guess there is some sort of standard for assigning Midi messages to these buttons
  • big picture: the Loopsynth could be a multi-function effect box that could integrate nicely with a studio
  • Hire someone?


G
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General Discussion / Re: Loopsynth v2 - MIDI - Windows 10 - USB Midi controller
« Last post by SuNo-san on March 07, 2022, 01:29:48 PM »
Quote
Forgot to say that the "MIDI to USB IN-OUT Interface Cable" mentioned above can be actually used with Loopsynth, in order to connect it to PC and then control it from a DAW. Not all of these cables can send all MIDI messages very well, I think many struggle with SysEx, but should be OK with basic control - sending notes and CC messages to control parameters.

Indeed, I have two of them - one works very well (for communication from Ableton to Loopsynth], not the other (at all).

Thanks again, Mario.

G.
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General Discussion / Re: Help with mellotron (channel 221)
« Last post by SuNo-san on March 07, 2022, 12:32:16 PM »
Thanks Mario. I will try that on the samples I want to load - I used these as a test of the functionality.

G.
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General Discussion / Re: Help with mellotron (channel 221)
« Last post by mario on March 07, 2022, 10:28:46 AM »
Quote
Now it works, however only with one note at a time ; playing two or three creates some artefacts

The reason is that there is no automatic level normalization, or any control over their mixing volume, data is simply added together. If the samples are loud enough, even mixing two of them will likely overshoot the headroom. This requires better preparing the samples. For example, normalizing by peak to -10dB will make sure that no sample is beyond 33% of the dynamic range, mixing 3 voices will then never cause clipping. Normalizing by RMS / loudness perhaps makes more sense, but I'm not sure how to choose the levels, may require experimenting to find out where will they sound balanced. Or maybe just adjust the volume of each sample by 50-60%, chance is that the clipping will be gone.

Quote
Also, contrarily to the doc, I can play more than 3 notes at a time (I believe 10? Have no more fingers).

If you play more than 3, the newer voices will be replacing older, there is a limit to how many files on the SD card can be open and read from at the same time. It is probably hard to notice what happens now that it all sounds distorted.
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General Discussion / Re: Help with mellotron (channel 221)
« Last post by SuNo-san on March 06, 2022, 10:18:18 PM »
Blindness... the naming came from bulk processing of the original filenames...

Now it works, however only with one note at a time ; playing two or three creates some artefacts : some noisy interferences that I don't know how to describe - I could record a sample if you can't reproduce it. attached is the correctly named directory.

Also, contrarily to the doc, I can play more than 3 notes at a time (I believe 10? Have no more fingers).

G.
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General Discussion / Re: Help with mellotron (channel 221)
« Last post by mario on March 06, 2022, 09:49:00 PM »
Hi Gilbert,
Thank you for detailed info, and the rar file.
I see that subdirs are all named with extra "-3" why is that?
They should simply contain a note (and possibly octave) e.g. "a#2".
The wav files are good to be named as they are.
Fingers crossed it will start working! 8)
Cheers,
Mario
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General Discussion / Help with mellotron (channel 221)
« Last post by SuNo-san on March 06, 2022, 08:46:44 PM »
I could not make it work (yet) - any advice ?

Checklist:

+ loopsynth v2  ;D
+ v1.xxx.118  ;D
+ mellotron directory and many subdirs ::)
+ .wav in the directories
+ mellotron directory on the SD card (checked twice)
+ 16-bit or less samples (VLC says so) - by the way, I am using https://sonicbloom.net/en/free-sb-mellotron-samples/ more precisely the Flute MK2 [attached]
+ Arturia Keystep 32, output midi channel 1, midi cable OK (tested elsewhere) connected to the DIN-TRS adapter (tried two of them, type A)
+ load channel 221 - seems OK (steady RDY yellow LED)
+ some signal seems to be coming in (kind of a small blue light led SIG is blinking)
+ volume B4 at high level (tested on channel 1)

-- no sound  :P ;D

Of course, this might be difficult to debug... but anyone can see what could be missing ? E.g. Midi Channel number ; should I "tune" something on the Loopsynth to get the Keystep 32 recognized further? I used it to define a chord progression, seems to work fine.

Gilbert
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General Discussion / Re: Loopsynth v2 - MIDI - Windows 10 - USB Midi controller
« Last post by mario on March 02, 2022, 10:55:33 AM »
Forgot to say that the "MIDI to USB IN-OUT Interface Cable" mentioned above can be actually used with Loopsynth, in order to connect it to PC and then control it from a DAW. Not all of these cables can send all MIDI messages very well, I think many struggle with SysEx, but should be OK with basic control - sending notes and CC messages to control parameters.
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General Discussion / Re: Loopsynth v2 - MIDI - Windows 10 - USB Midi controller
« Last post by mario on March 02, 2022, 10:49:25 AM »
Hi, thank you for your question and detailed info about what you tried.

Unfortunately this does not work because the USB is there only for power and firmware updating, no other functionality is implemented.
The driver chip is not capable of emulating MIDI over USB (or any other advanced modes like for example mass storage), it is merely a "virtual serial port" (similar to for example Arduino development boards and many other). Normally there is no reason to connect Gecho to any USB port other than for powering.

Unless your controller also has the classic, opto-isolated MIDI (DIN5 or 3.5mm TRS Jack) output, you'll need a USB host. The host is meant for connecting a MIDI controller, it translates data from a USB MIDI device into the 2-wire MIDI signal.

By "USB host" I mean something like this: https://www.aliexpress.com/item/4001202281136.html
NOT this, as this cable has the opposite purpose: https://www.aliexpress.com/item/1005002736754622.html

These are just examples, I haven't tested any particular one - soldered mine from these modules:
https://www.hobbytronics.co.uk/usb-host-board-v24
https://www.hobbytronics.co.uk/midi-breakout

Quote
W10 does not seem to 'recognize' the Loopsynth (no sign under devices that it is plugged in) -  I read somewhere that a driver would be needed? If yes, where, which?

There are drivers but they are only needed for firmware updating / development. In theory a driver could be written that acts as a "virtual USB host" and creates virtual MIDI instrument in Windows, to integrate with various software or even to make the PC a host for external hardware controller, but writing such driver is beyond my knowledge.
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General Discussion / Loopsynth v2 - MIDI - Windows 10 - USB Midi controller
« Last post by SuNo-san on March 01, 2022, 08:54:06 PM »
[Edit: reading more doc... I see that Loopsynth does not support Midi via USB. So I have an answer... for the feasability of my question 0. I leave this post for people who could have similar questions]
[Edit 2: moved the edit above from the bottom of the msg to the top.]

As confused as usual with connectivity issues... Can someone help me by telling me what is possible and what is not ?

Gecho Loopsynth V2 1.0.118
Windows 10
Midi controller with only a USB midi plug (not 5 pin midi out) ; namely Arturia Minilab MKII

0- I don't own a standalone midi host. So... I tried to plug the Loopsynth via USB to my W10 PC, and use Ableton live to route the Arturia Midi via USB to the Loopsynth USB plug.

1 - W10 does not seem to 'recognize' the Loopsynth (no sign under devices that it is plugged in) -  I read somewhere that a driver would be needed? If yes, where, which?
2 - Ableton does not see the Loopsynth (sounds fair if W10 does not).

So... is #0 above even possible ? And how would I make it work.

G.
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