Verified by Michael Whapples (thanks), closing therefore.

Michael Prokop <mika@grml.org> has uploaded a package that may fix your bug.
Please test the package and inform the maintainer whether
version 1.2.3 of grml2hd works as intended or not.

Thank you

The changelog is attached below

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Hash: SHA1

Format: 1.8
Date: Sat, 13 Jun 2009 02:24:54 +0200
Source: grml2hd
Binary: grml2hd
Architecture: source all
Version: 1.2.3
Distribution: unstable
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 grml2hd    - make a harddisk installation of grml
Changes: 
 grml2hd (1.2.3) unstable; urgency=low
 .
   * grml2hd-bootparams: replace speakup_synth with speakup.synth.
     Thanks to Michael Whapples for the bugreport. [Testing: issue689]
Checksums-Sha1: 
 34c55f2e86421c2865565496d9174b0938f36562 916 grml2hd_1.2.3.dsc
 190c4f573c4b8d3d8eea69ff53a370659bc67a5f 294645 grml2hd_1.2.3.tar.gz
 5704aa9f758269c281d7931a4fbcfa7abf3665e6 295278 grml2hd_1.2.3_all.deb
Checksums-Sha256: 
 cc851c4f5b45ce8c0dc496fcadb9ac6c853e8a1680233eedd1707ff13f35b52f 916 grml2hd_1.2.3.dsc
 996ae77b70609fb224b4176ecf8f8d542fa8188c0045f0717f165f7939217653 294645 grml2hd_1.2.3.tar.gz
 19391786a269bb93fddece0ebc8f3ffa5b73e48586f005d0dc938790b84055a1 295278 grml2hd_1.2.3_all.deb
Files: 
 fdadd7a9a72d622e253867a2f9dcf97c 916 grml optional grml2hd_1.2.3.dsc
 3f223e5e3a4a0182b59b6082c5756ba0 294645 grml optional grml2hd_1.2.3.tar.gz
 572a430e40f09f3ef4bef0998952ac1e 295278 grml optional grml2hd_1.2.3_all.deb

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Bugreport by Michael Whapples:

I noticed that in grml2hd when it prompts you for which boot parameters
should be used for the append line it gives the speakup one as 
speakup_synth although now grml uses speakup.synth, therefore users
can't add speakup.synth to an installed system through the interface,
they have to do it manually using the boot loader. I noticed this when
using a grml 2009.05RC2 CD (I know that grml 2009.05 has been released
but I had the rc2 CD to hand when I needed to perform the install and I
have just updated grml2hd on my system and examined the source code and
this bug seems to still be present).