Hello,
I'm now part of this forum, thank-you.
I few words about me : I'm about 50 y/o, I live in France, in Paris area. I work in the automotive field, especially in the infotainment systems. My interrests are in electronics, hardware, embedded systems programming. I'm also learning again the piano, on a Yamaha P-125. I bought a few days ago a PSS-A50, especially "for fun" but also in order to analyse the HW, and potentially to "mod" it.
I focussed on this PSS-A50 product because I read many interresting articles from @pjd, on his site (
http://sandsoftwaresound.net/yamaha-pss-a50-look-inside/)
I would like to contribute to the discussions about this, and especially share a piece of information, following my first investigations and prototyping on this PSS-A50 : This keyboard has stereo capabilities (the samples are in stereo), but unfortunately, the engineer only used/wired the left channel of the SWLL YMW830-V. They could save some cents on the cost of a dual OpAmp, using a dual instead of a quad.
I'll try to write something about this or to join @pjd : I wired the DACLPP/DACLMM and DACRPP/DACRMM outputs of the SWLL to an external active Low Pass filter with a basic LM324 and a few resistors/capacitors (same schematics as for PSS-F50, and... indeed, the sound is now a very audible stereo for all samples. (I'm dissapointed because the Motions Effects the programmed are not stereo).
Hope to write again soon,
Lionel.
[update] : I uploaded a video with sound. Have a look there :
https://youtu.be/cwDBfVab3vc