And I agree .. the unvoiced/voiced rule works automatically for /t/ and /d/ "ed" pronunciation .. to try to twist the  unvoiced "ed" to /d/ is not logical and darn near impossible to do ...  I'm not familiar with truspel but from what I've read here, it is a phonetic system of spelling and every dictionary I've every used has the phonetic spelling of jumped as /jumpt/ .  

________________________________

From: englishlanguage-bounces at nifl.gov on behalf of Bonnita Solberg
Sent: Mon 1/15/2007 2:31 PM
To: The Adult English Language Learners Discussion List
Subject: [EnglishLanguage 1000] Re: pronunciation of ed


The "t" sound of "ed" at the end of a word indicates past tense, as does the sound "d" or "ed" or "id".  I have not heard anyone in an American English conversation say "jumped" four times in a row, so this point escapes me.  Although the sound "d" for "ed" at the end of a word is, in some cases, easier to say, this example does not support that "sometimes."  In this case it is a contortion of American English to say "jumpd", which is neither easy or used in "flowing" speech.  

Tom Zurinskas <truespel at hotmail.com> wrote: 

	Thanks Tom, good points. My problem was how to phonetically spell "jumped" 
	in truespel. (Someone said the books say ~jumpt, which started this 
	discussion). I decided on ~jumpd. It retains the "d" to show past tense. 
	It is mostly spoken "d" in flowing speech. Saying ~jumpt four times fast is 
	much more a strain (to get that aspiration in at the end of "t") than 
	~jumpd. This shows that ~d is easier to say, and speech tends to lean to 
	the easiest pronunciation.
	
	Tom Zurinskas, USA - CT20, TN3, NJ33, FL4+
	See truespel.com and the 4 truespel books at authorhouse.com.
	
	
	>From: "Thomas N. Robb" 
	>Reply-To: The Adult English Language Learners Discussion 
	>List
	>To: "The Adult English Language Learners Discussion 
	>List"
	>Subject: [EnglishLanguage 997] Re: pronunciation of ed
	>Date: Sun, 14 Jan 2007 11:50:37 +0900
	>
	>What is happening with the /d/, compared with /t/, endings is technically
	>called "devoicing". The "voiced consonants" such as /b/, /d/, /g/ and /v/
	>tend not to be fully voiced at the end of words, so they end up sounding
	>pretty much like their unvoiced counterparts /p/, /t/, /k/, and /f/. We
	>can't really say that they become the same, however, because if the
	>following word begins with a vowel, then the full voicing is heard.
	>Compare:
	>
	>He jumped.
	>
	>He jumped in.
	>
	>Cheers,
	> Tom Robb, Japan
	>
	> **Join PacCALL http://www.paccall.org **
	>
	>** Thomas Robb, Kyoto Sangyo University, Japan **
	>** **
	>** http://www.kyoto-su.ac.jp/~trobb/index.html **
	
	
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