Messages

1

preenfm2 and preenfm3 / Re: Distortion when more than 1 voice (RESOLVED)

« on: July 14, 2020, 08:03:22 PM »

Suggestion about mix levels is a good one but, strangely I do not seem to be able to repeat this problem and all patches now seem very clear to me.

Also, I re-housed my Preen in the official case & made an OLED screen out of 2 pieces of perfboard back to back (copper sides together) and sandwiched a couple of sheets of goild between them.  Then I just taped the 2 pieces together, insulating the edges.  The benefit of this EMF screen is that there is no risk of short circuits from OLED or board components penetrating through a polythene bag.  Anyhow, very happy now - cannot hear the whine any more.

2

preenfm2 and preenfm3 / Distortion when more than 1 voice

« on: July 11, 2020, 05:28:32 PM »

Hello,
I've just finished building a new PreenFM2.  I notice that when I play a patch with a single note  - sound is clear but when I play a second note (or more), the clear sounding patch turns noisy - just like clipping distortion.  Any suggestions?

Also, I have extremely good high frequency hearing and will use Preen with headphones.  I do not think any of the OLED fixes will make the whine go away so I am considering 'downgrading' to a 2004 LCD and modify the case to fit.  Are there any downsides to going to LCD (other than aesthetics) ?

Many thanks
Chris

3

preenfm2 and preenfm3 / Re: USB Driver on Windows 7

« on: April 13, 2015, 09:54:09 AM »

Hi Xavier,

An update for you.  I built an Arduino based usb - midi interface that uses standard Windows Class drivers.  When I connected it to my laptop, it wouldn't load the correct driver either - so its definitely my laptop that is the problem.  Well, I decided to buy a new laptop with Windows 8.1 and both devices work perfectly.  I will just rebuild my other laptop at some point.

4

preenfm2 and preenfm3 / Re: USB Driver on Windows 7

« on: April 07, 2015, 05:56:18 PM »

Hi Xavier,
This is clearly not a problem with the preenfm2, but with the notebook that I am using.  For the time being. I will connect using my usb to midi converter which works fine.

I've tried all sorts of tricks to get it to use a different driver, but it keeps reverting to what I think is a mass storage driver.  I have tried copying the driver files from the working machine but it makes no difference.  I suspect if I rebuilt the OS, it would work fine.

Out of interest, is the midi client code yours or standard ST Microelectronics?

Chris

I will keep searching for a solution in the background & let you know if I find one.

5

preenfm2 and preenfm3 / Re: USB Driver on Windows 7

« on: April 05, 2015, 05:15:30 PM »

This gets more curious.  I connected the PreeFM2 to another box with Windows 7 and it was correctly identified as aSound, Video & Game controller device.  I have deleted all references to PreeFM in the registry and as soon as I connect it, it is identified as the wrong type of device.

6

preenfm2 and preenfm3 / USB Driver on Windows 7

« on: April 04, 2015, 08:26:35 PM »

Hi,

My Preenfm2 connects OK via USB and is recognised as a DFU device when started in DFU mode.  When started in normal mode it is recognised as PreenFM mk2 (Interface 0) but is classified as a USB Device rather than as a Sound, Video & Game controller device.  As a result it does not appear as a midi device in any of my midi player applications (although my M-Audio UNO does).  The OS is Windows 7 32 bit.  I have connected the module to a Windows 8 machine & it is recognised fine as a midi interface.

Any ideas how to force my PC to recognise PreenFM2 as an audio/midi device?

7

preenfm2 and preenfm3 / New build - couple of useage questions

« on: April 03, 2015, 11:57:50 AM »

Hi all,
I received my kit 2 days ago and built it in about 3 hours. Its a wonderful machine. I have 2 questions at the moment about useage as follows:

1. Is the op amp capable of driving headphones directly using a cable adapter?
2. Will the usb port operate in 'Host' mode so that when powered through the barrel jack a master keyboard can be connected to the usb and receive its power from the preenfm2 as well as being able to send midi over usb?  If not, that would be a really useful feature to minimise the number of cables around.

Chris