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i think too that we are discussing techniques taking to confused questions(and i like it)
have any way to measure the 32bits processing inside Plogue?
as Plogue is processing in 32bit, no need to dither when the output is 24 or 16bit?

Yes there are ways to measure. One way is a free VST called bitter:

http://www.stillwellaudio.com/?page_id=33

If you put it on the output of player you will see 16 bits, but at soon as you pass it through any processing bidule, such as a gain bidule ( set at anything other than 0dB) you will see 32 bit float.

Why? Because Plogue's internal format is 32 bit float. The player converts the FORMAT to 32 bit float, but you only have 16 bits of data so that's all you see at the output. Note that this is exactly equivalent to changing the bit depth without re-sampling. However, when you do any math operation, like changing the gain, you are doing 32 bit math so you get a 32 bit answer. Gain = multiply. 16 bit * 32 bit float = 32 bit float result.

Re dithering, 32 bit float and 24 bit fixed both use THE SAME 24 bits for values of -110dB (approximate) to 0 dB, Therefore, there is no reason to dither (the process of ADDING NOISE) when going from 32 bit float to 24 bits, as long as you stay below clipping, which you need to do anyway.

I forget the exact value on the low end (that's why I said approximate) but it is at least a 100 dB down and if you can hear that after DTS encoding you probably will not like anything other vinyl and spam amps anyway.

Cheers!

i have 3 dvd players: 2x Philco DV-P3000 and 1 tronics DVD-595.
all players have spam multicahnnels outputs(RCA)
testing DVD-Video(Nero DVD+RW) with one music 5.1 16/48KHz LPCM authored in DVDLab Pro palying with Philco via coaxial to receiver decoder Sony. (16b 88.2K and 96K not tested, maybe later)

works but the decoder show in front panel PCM 48 (L, R and LFE).

all channels are summeds in Left channel, reminders are in silence in decoder but i have secure infos that using spam outputs works perfectly...i will test later as the cables are in complete mess behind one big table and is needed to move all with computer, players, receiver, amplifiers...lots of things...gee..my wife will kill me

about dither:
have one big thread in S.Hoffman forum about that. i posted there changing infos with Barry Diament(cool person) and he send me round 26 samples using differents dither tools.
my answer was: 'i hear 'sss' in all samples. ...i prefer 'no hear' truncation than hear hisses(sss) Barry, no way.
using short samples, tones and all know ways i don't use dither and never could find any truncation hearing or watching waveforms using extreme zoom.'
the conclusion: dither is the necessary evil but i don't use in wave editors, now after yours comments i will test in Plogue.(if don't 'sss', is ok for me)
if you're interested to read i post the link in S.Hoffman forum. (too big lecture)

thanks Zeerround for 'bitter'.
thank you all for great comments.

edit: "Tales" means 'Yes - Tales of Topo...Ocean?!?