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MIDI2XS

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Posts posted by MIDI2XS

    Yam FC7 pot

    in The Keyboard Corner

    Posted

    Hi,

     

    50k B hints that the pot is 50kohm (50000ohm) and has linear taper. Letter A would indicate logarithmic taper. I can`t see that Yamaha would bother using some custom/extraordinary type of potentiometer for a bulk product like the expression pedal anyway.

     

    Jyrki

    Alps RK16 pots can be configured in various ways...

    https://tech.alpsalpine.com/prod/e/pdf/potentiometer/metalshaft/rk16/rk16_varietyother.pdf

     

    By "custom", I mean a variation that is not normally stocked/off-the-shelf.

     

    For the RK1631110G, I don't know specifically what the G suffix indicates.

    Yam FC7 pot

    in The Keyboard Corner

    Posted

    Thanks but Google does not return any hits on "Yamaha repair depot." I see a Yamaha site where I need to set up a "consumer account", after which they'll presumably let me in to search for this pot. I may need to provide a Yam part # but can't find any online resource for that. [...]

    I suspect the "Yamaha site" you mentioned is yamaha24x7.com

     

    This is the pot info...

    WF876300 VR ROTARY B 50.0K RK1631110G FC-7

     

    WF876300 is the Yamaha part number

    RK1631110G is likely the Alps number, which may be a custom device

    Cracked diode on underside of Fatar TP8SK (in GSI DMC-122)

    in The Keyboard Corner

    Posted

    It's just a signal diode. Not a critical special purpose component. Is it surface mount or through hole?

     

    Agreed. All the keybeds I've ever seen with diodes on them have used signal diodes 1n914 or 1n8148 (same size diodes, little bit different specs). If you can desolder and solder, DIY and save.

    I suspect you probably meant to refer to a 1N4148. The 1N8148 is a TVS (Transient Voltage Suppression) diode, not appropriate for the purpose and about 100 times as expensive as a 1N4148.

    iPad - Sys Ex to Yamaha

    in The Keyboard Corner

    Posted

    Thanks MIDI2XS. I was aware of the device ID used with Sysex but was referring to this:

     

    Universal system exclusive messages

     

    There are two universal IDs that can be used by system exclusive messages instead of the specific manufacturer IDs above. Since these two IDs are not specific to a manufacturer, but universal, all MIDI devices should consider responding to those. These IDs are as follows.

     

    Hexadecimal value Decimal value Description

    0x7E 126 Real time

    0x7F 127 Non-real time

     

    In other words, 0x7F is carried by system exclusive messages to which all MIDI devices should respond to in real time (immediately) and 0x7E is carried by system exclusive messages to which all MIDI devices will respond to, but not in real time (not necessarily immediately). For example, the MIDI full frame message is a system exclusive message with manufacturer ID 0x7F. This message prompts all MIDI devices to immediately cue up to a certain point in time.

     

    The first byte after the real time / non-real time ID is the "system exclusive channel". Normal system exclusive messages do not have a channel, but universal system exclusive messages do have a channel that could be from 0x00 to 0x7F (from 0 to 127). Normally, the system exclusive channel will actually be the manufacturer ID in the table above (e.g., 0x41 for Roland), so that the message can be sent to a specific MIDI device. If the system exclusive channel is 0x7F then this message is for all MIDI devices.

     

    The two bytes after the system exclusive channel are sub-IDs and describe what the message is about. For example, the two bytes '0x01 0x01' show that the message is the MIDI Full Frame message and that the rest of the data should be used to discern time to which the MIDI device should cue.

    Sorry, although my previous post immediately followed yours, it wasn't meant to question what you posted - I only mentioned Universal SysEx at all since you brought up the topic. I was mostly addressing previous comments in the thread which seemed to indicate a small misunderstanding concerning MIDI channels, and I wanted to clarify the issue.

    iPad - Sys Ex to Yamaha

    in The Keyboard Corner

    Posted

    There seems to be some confusion over MIDI Channel versus Device ID. SysEx messages don't include MIDI Channel.

     

    The first three bytes of a typical SysEx message might be...

    F0 43 10

    where...

    F0 = Start of Exclusive

    43 = Manufacturer ID (43 is Yamaha)

    1n = Device Number, n = 0~F (1~16 decimal)

    followed by model ID bytes, then data, and finally...

    F7 = End of Exclusive

     

    Device Number isn't MIDI channel, it's an identifier for which of the up to 16 synths of the same model you want to direct the message. I suspect that few of us have multiple "whatevers" in our rigs, so this capability doesn't usually get much use. It may have had more application when synths tended to be mono-timbral, and a bank of them was needed to get multiple sounds simultaneously.

     

    By the way, that third byte isn't always "1n" - for Yamaha, that would signify a Parameter/Mode Change message, while "0n" is for Bulk Dump, "2n" for "Dump Request", and "3n" for Parameter Request messages.

     

    Universal SysEx, somewhat of an oxymoron, doesn't have Manufacturer ID.

    My QSC speaker fix, 5 years late! (LONG-you've been warned!)

    in The Keyboard Corner

    Posted

    [...]

    Drumroll⦠my lucky streak continues! The channel is fixed. I almost can"t believe it. I had the speaker on last night and played through it for a few hours. All seems good, but there"s one issue and that"s shown in this next picture - I think my wire-wrapping fix on the XLR jack"s terminals kept me from seating it fully on the board, so it stands a little higher now. When I tightened the screws to the standoffs, the board got slightly bowed. I"m not gonna try to re-solder the connector, as I think that"s risking me lifting more pads or traces. My plan is to hit the hardware store for some washers to lift the board off the standoffs a little more. I"m really hoping that does the trick. Something tells me that a bent board, in a piece of equipment that"s gonna get banged around a bit, is not a good idea.

     

    If you"re still reading this - congratulations! Thanks for hanging in and thanks again to all the folks that helped me out five years ago. I see that MIDI2XS hasn"t posted in a while, I hope he"s doing OK. Get ready, my OBXa rehab project is gonna start up soon! :)

    Thanks for the update, and it's great to see that the repair was successful!

     

    Thanks also for well-wishes - I'm OK, just otherwise busy and my dial-up internet connection limits my ability to participate in this forum.

    Repair advice - where to go to get the parts

    in The Keyboard Corner

    Posted

    [...] Does anyone have the contact information to get the part I need from both Yamaha and Hammond-Suzuki?

     

    I am handy enough to do the repair myself. After all, I re-strung the low end of a Yamaha CP70B myself - twice, and have done multiple key replacements. I've even replaced various circuit boards on my Korg N364. I just need to find the parts.

    If you have the Yamaha part number(s), https://www.yamaha24x7.com/

     

    Otherwise, https://usa.yamaha.com/support/parts_manuals/index.html

     

    Yamaha CP88 and 73 - Deserve their own thread

    in The Keyboard Corner

    Posted

    It remains to be seen what additional sounds Yamaha will provide. It wouldn't surprise me if user requests might influence that.

     

    However, the PDF from Easy Sounds says:

    "CP is Yamaha's acronym for Combo Piano."

    ---- and ----

    "The new CP series from Yamaha provides an answer to the question of what standards are set for a Stage Piano today."

     

    Those statements may or may not be a clue to Yamaha's intent.

     

    Yamaha MODX

    in The Keyboard Corner

    Posted

    Motif XS = 3:15secs fyi

     

    or maybe it was 2:15secs.... i cant remember, but its painfully long boot

    Perhaps when AutoLoading a file. Otherwise, the XS boots in a bit more than 30 seconds.

     

    Boot time for a Motif XF can vary considerably, dependent on the number and capacity of any installed flash modules.

    .About 30 or so seconds for XF sounds about right. It takes twice as long (maybe a tad longer) than MOXF - thats when both have the same single Flash installed. I actually dont think flash adds to time to boot as internal memory retains a stored map of what waveform maps to what - that is why when you put a flash board into a XF, it installs it - reads/creates that map. It only does that upon initial install of flash board. After that the map is just there.

    It's not about mapping Waveforms - boot time seems unaffected by flash module contents. Rather, in my experience boot time is affected by the presence and size of the flash module(s). I increased the size and number of modules in my XF6 in stages. Each increase caused the boot time to also increase. I now have two 1GB modules installed, and boot time is a full minute. Apparently the XF does some basic checking of installed flash. Whatever it's doing, it takes some time.

     

    Yamaha MODX

    in The Keyboard Corner

    Posted

    Boot time = ~ 16 seconds. Similar to MOXF, much faster than Motif XF.

     

    Motif XS = 3:15secs fyi

     

    or maybe it was 2:15secs.... i cant remember, but its painfully long boot

    Perhaps when AutoLoading a file. Otherwise, the XS boots in a bit more than 30 seconds.

     

    Boot time for a Motif XF can vary considerably, dependent on the number and capacity of any installed flash modules.

     

    Yamaha MODX

    in The Keyboard Corner

    Posted

    ^^^

    Listening to the piano up to around 1:30 with Neumann KHS120s and a Benchmark DAC 3-- the Montage has a noticeably thicker, fuller, more rich sound.

     

    I don't think you would be able to discern a huge difference, live in a group, with generic $500-600 speakers.

     

    I think the Montage is just mixed a bit louder.

    Could be - a slight increase in recorded level is typically perceived as sounding "better", not "louder".

     

    https://www.teachmeaudio.com/recording/sound-reproduction/fletcher-munson-curves/

    https://ehomerecordingstudio.com/fletcher-munson-curve/

     

    Yamaha MODX

    in The Keyboard Corner

    Posted

    Not sure I want to open this can of worms, but wasn't it settled on the Motifator site that the MOXF and Motif XF use the same DAC? [...]

    No, they use different DACs. The Motif XF (and the XS) use the Asahi Kasei AK4393 DAC. The MOXF uses the Wolfson WM8740. Both are 24-bit 192kHz devices. The WM8740 might be less expensive than the AK4393, but it performs well and can be found in some higher-end audio gear.

     

     

    [...] I haven't really discerned any difference in sound quality between my MOXF and Motif. (ducks...)

    There's little difference in sound quality between the XF and MOXF. Most listeners on Motifator were unable to discern a difference between the same material recorded on an XF versus a MOXF.

     

    Yamaha MODX

    in The Keyboard Corner

    Posted

    [...]Dropping after touch is silly (imho).

    It's been standard practice for Yamaha. The Motifs have aftertouch, the MO models don't. To get all the features you have to pay the price for the flagship model.

     

     

    I cant make out the back of the unit... is there an expression pedal input?

    As best I can tell, besides the USB connectors, left to right it's...

    MIDI OUT

    MIDI IN

    FOOT SWITCH ASSIGNABLE

    FOOT SWITCH SUSTAIN

    FOOT CONTROLLER 2

    FOOT CONTROLLER 1

    OUTPUT R

    OUTPUT L/MONO

    PHONES

    A/D INPUT R

    A/D INPUT L/MONO

     

    So it appears there are two inputs for a continuous pedal.

     

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