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But which action?

It's BHS which means Balanced Hammer Standard and I suspect it can be modified GHS (made to not be graded), due to the word "standard", unfortunately. It can be true because of very low weight of the instrument - 13,1 kg.

Some people think this is the action from Montage 8 or the 8 versions of Motifs, or S series, described as Balanced Hammer Effect Keyboard. I think that BHE is a non-graded version of Graded Hammer (GH), knows also as Graded Hammer Effect (GHE), never before described as "standard".

So, why Yamaha described the key action of CP73 as "standard"?

There _is_ a Yamaha "Graded Hammer Standard" (GHS) action. Perhaps if you make it un-graded, it becomes "Balanced Hammer Standard" ?

The GHS action is used in a bunch of low-end Yamaha DP's, and some 88-key synths and workstations, I believe.

Surely hope this isn’t the case.
I really want a CP73 with a good action and I absolutely dislike the GHS action in their MODX8.

I seriously doubt this will feel anything like the MODX8. This is meant to to have an action more like an electric piano than a acoustic grand.
At this price point, I don't believe they would put in there cheaper action. For those who have to have an acoustic grand action there is the CP88.
How many acoustic grands have you seen with 73 keys? This looks to me like they were aiming straight at Korgs Grandstage 73 and SV1- 73 when they designed this.
I would bet it feels better than Korgs RH3.

I hope so.
Yet the CP73 action is not called BHE (Balanced Hammer Effect) as in Montage 6/7 but BHS (Balanced Hammer Standard) and this could mean it’s inferior similar to the way MODX8’s GHS (Graded Hammer Standard) is inferior to GHE (Graded Hammer Standard).

I suspect that may simply be a reference to its hammer action being balanced rather than graded.

It's both, isn't it? The use of non-graded hammer actions in these stage pianos is typically to serve as a compromise between an acoustic piano feel, and an electric piano, synth or organ feel.

My point was simply that the 88's graded hammer action is designed to more closely resemble an acoustic piano, while the 73's balanced hammer action would more closely resemble an electric piano, simply in terms of the relative feel of the keys across the keyboard. Neither is well suited to organ, and I wouldn't worry about which sucks less. ;-) But on that topic, there are some hammer actions that are better than others if you must play organ from them... but there is not necessarily any correlation between that and whether or not they are graded. The graded MP7 is better for organ than any of the balanced hammer actions I've seen from Yamaha. Amount of force needed to trigger a note, trigger point, speed of return, shape of the edges of the keys, are all relevant variables.

I've both played it and asked Blake Angelos what action it has. He said "it is the same thing that is in the Montage 8, but without aftertouch" so that is my source.

I wonder, then, whether/how it is different from the action in the MO8? That was BHE (like Montage 8) except without aftertouch.

Yes, it would be an unfortunate naming scheme if "Balance Hammer Effect" meant a "Graded Hammer" action with aftertouch, and "Balanced Hammer Standard" means a "Graded Hammer" action WITHOUT aftertouch, as opposed to a "Graded Hammer Standard" action with or without aftertouch Wait, what were we talking about again?

No sympathetic resonance? Really?

€1799 in Thomann. For comparison, €2149 for Nord Electro 6 HP, €2299 for CP88.

Who needs string resonance for a lightweight 73-key gigging board? It has damper resonance which is the one that could eventually be heard by a live audience

I’d like to use it in my studio too, it’s that portable

I agree it's not strictly needed in a portable, chopped board. But...why exclude it? I can't imagine it costs that much to implement a VRM or other package that Yamaha had already had for years, and which already exists on their other, cheaper portable instruments? This particular detail seems a bit nickel-and-dimey to me--unnecessary product segmentation.

It looks Yamaha dropped much more important features than "string resonance" in CP73/88, like SCM sound modelling for example. (smooth timbre transition between samples)

My guess is that the CP73/88 sound engine is derived from the MODX, which was derived from the Montage... and those instruments didn't have it, so this one doesn't. You can't necessarily just "glue" code from one underlying platform to another. Just because they implemented it on other models doesn't mean that the Montage architecture could support it.