Can you let me know how to use voice recording functin on K660i? I would like to use this for meeting/coaching session.

get

a usb battery bank


google this useful device.

Do you mean that the video file recorded by gotomeeting couldn't be played on your Windows 8? You should pay attention to its format, the gotomeeting video file is not supported by the most of players. If sometimes you need to review your gotomeeting video, you'd better to use other screen recorders which could record your session in common formats, such as MP4, AVI, WMV, etc. There're many free screen recorders could do this, like CamStudio and oCam. Besides, I can offer you a guide about how to use a useful application to record gotomeeting.
How to Record GoToMeeting Session with Good Quality

Maybe you can have a try Leawo Music Recorder. Leawo Music Recorder is a superb but easy-to-use music recording software program that lets you record free music from any built-in input audio, computer audio and online music sources, like YouTube, Spotify, AOL Music, Last.fm, etc. and then save in MP3 or WAV format with lossless quality.

The following simple step-by-step tuturial guide shows you how to record online audio file on Windows with Leawo Mucis Recorder. The turotial for recording online audio file on Mac is the same given that the user interface of Leawo Music Recorder is the same as that of its Windows counterpart. Therefore Mac users can get know-how below as well.
Step 1: Select audio source
Leawo Music Recorder could record both built-in input audios and computer audios. As you want to record online audio file, before recording, select "Record Computer Audio" in Audio Source settings panel, which could be invoked by clicking the "Audio Source" icon on the bottom-left corner.



Step 2...
For more detail, check: https://www.leawo.org/tutorial/how-to-record-audio-from-the-internet.html

You can't. Audiobooks are just like music, and the Sansa treats them that way. Think of them as words spoken without music.

Voice recordings are made on the Sansa, when you use it as a digital recorder. You can record lectures, meetings, or notes to yourself, and play them back.

See the sleep timer value setting

Select the file, then press erase and follow the display. If you hold down erase, you should get an erase all option. Also you can select Format in the menu.

Difference between 4cm and 1.2 cm speed is just like SP and LP speed in VCR etc. 1.2 cm speed selection will give you more recording time on same cassette.
VOR stand for Voice Operated Recording, if you enable this vor option, tape starts recording only at that time when sense any voice and will remain Pause if there is silence.
This option will also give you more recording time at same cassette by skipping empty space.

I'm afraid that the only solution I can think of would be to put in a new set of batteries. If your quick about it, your might not lose the information.

when you copy the files to your computer the files are still in the ws-100, you have to erase them in the ws-100 buttons after that.

You can download it from this site:
http://www.retrevo.com/search/v2/jsp/downloadPage.jsp?doc=e50cb0e0116e016aa561b231a9d4e893&q=RCA+RP5012