@catymag,

new vpm file (PCM 22khz, 8 Bit mono 176kbps) stays mute
went back to the guide and I am stuck due to this contradiction:

"...it is recommended that you choose this format: WAV (Microsoft 4 bit IMA ADPCM,...) ... I couldn’t get my file to work with that ADPCM setting"

so, is ADPCM recommendable at all or not and are your PCM settings
(352kbps, 22050hz, mono, 16bit) suitable for a nuvi 200 and c510?

regards
Damian