I've managed to replace the intro SONIC 3D - Flickies' Island (E) [iso+ape] [TOC Confirmed].rar (grab it at gametronik) file SOP.AVI using Ultraiso but my converted intro doesn't play any sound and I can't get DK4BIT to show up inside Aviedit as explained inside compress.txt, if somebody is bored they can install all this and see if they can get sound working. Here's everything you need: VirtualBox https://download.virtualbox.org/virtualbox/5.2.18/VirtualBox-5.2.18-124319-Win.exe Virtualbox Extensions https://download.virtualbox.org/vir...VirtualBox_Extension_Pack-5.2.18.vbox-extpack Microsoft MS-DOS 6.22 with CD-Rom Support [Virtual PC VHD] http://ricky.winworldpc.com/Abandonware Operating Systems/Virtual Machines/Microsoft Windows/Microsoft MS-DOS 6.22 with CD-Rom Support [Virtual%20PC%20VHD].7z Win98SE with usb support http://ricky.winworldpc.com/Abandonware Operating Systems/PC/Microsoft Windows/Windows 98-ME/Microsoft Windows 98 Second Edition.7z usb drivers for win98 http://download1406.mediafire.com/e5gk0a9symgg/ylqlc2qpksku5pg/nusb36e.exe https://www.raymond.cc/blog/how-to-install-usb-mass-storage-device-on-windows-98/ gfx drivers for win98 http://download.fileplanet.com/ftp1/hardware/utilities/sdd-win-18.104.22.1680-BETA.exe Duck encoder for use with Videdit and Aviedit: http://segaxtreme.net/content/satdev/Tools/sega/Duck.zip serial: CPHUCKKRKEKPP AviEdit ftp://ftp.sac.sk/pub/sac/graph/avied338.exe Videdit http://www.earthstation1.com/UtilityFiles/!videdit_.zip Duck video player for windows http://segaxtreme.net/content/satdev/Tools/audiovideo/duck.zip Super http://downloadcare.gotdns.com/GetFile5.php?SUPERsetup.exe contains a lot of adware, use another video converter of your choice Ultraiso https://www.ultraiso.com/uiso9_pe.exe And of course use https://segaretro.org/SSF for actual testing Heres a good video short video you can use rip it using https://addons.mozilla.org/en-US/firefox/addon/video-downloadhelper/ and then convert it to old school avi using super for use with Videdit, right click on SOP.avi from Sonic and look in codec/media for the settings you should use when converting stuff inside Videdit. Win98SE has no shared folder support in Virtualbox, you have to get files over by using a usbstick or mounting a .iso with the files. From compress.txt (inside Duck.zip) "Compressing Audio The TrueMotion player will play uncompressed, 8-bit mono and stereo, 22.05 and 44.1khz audio. In addition, you can compress 16 bit mono and stereo audio using Duck's 4-to-1 (4-bits-per-sample) audio compression, DK4BIT. A future release will support DK3BIT stereo 3-bit-per-sample compression as well. Using VidEdit, you can insert uncompressed audio in Microsoft Waveform, Apple AIFF, and raw PCM formats. Other applications may support these and/or other formats. Whether you intend to compress audio or not, the first step is the same; you must insert the audio, check synchronization, and resave the file (using `no recompression'). Here is an outline of the necessary steps: Select `Insert' (again, we assume VidEdit but other apps may work). Select the audio file format needed. Select the file. use `Synchronize' to check sync at various points in the file. Select `Save As' in the File menu. Select `Compression Options'; in the `Target' field, select `Hard Disk (Interleaved)'. In the `Video Compression Method' field (or is it a box?), select `No Recompression'. Select `Details>>`. In this dialog, check `Interleave audio every', and make sure `Frames' (to the right) is set to 1. Select `OK', and `OK' again. For long files, saving to a different disk drive may go faster and is nicer to the drives. To compress audio, the inserted audio file must be in 16-bit format. After saving the file with audio, run AVIEdit. There may be other programs that support audio compression of AVI files in Windows; if you find one, please let us know. Don't be greedy; share it with the class! Open the AVI file. Under the File menu, select `Save Options'. In the `Choose a stream...' box, select the stream labelled `Audio #1' (if you have more than two streams, one video and one audio, you screwed up). Select the `Interleave every' box, and set `Frames' to 1. Select `Options'. In the `Format' box, you should find the "DK4BIT AUDIO" compressor in the list; select it. (if it isn't there, it was not properly installed). The `Attributes' box should now display something like `44.1 kHz, 4 bit Mono -- 22 kb/sec' or somesuch. Select `OK'. Select `OK'. (that's not a typo; you were 2 dialogs in!). Now, under the `File' menu, do a normal `Save As' (you should use another name; perhaps append a 4). If all goes well, this file should play nicely using Media Player. Important note: compressed audio files will not load or play under VidEdit! This is expected; that's why we use AVIEdit to compress audio. Notes on Audio Compression 44 khz, 16 bit audio sounds better than anything else. Using DK4BIT, in stereo this takes 44 kbytes/sec; with our new DK3BIT, it will use about 33kbytes. If you have to use 22khz, we suggest that you use 16 bits and compress the audio (rather than 8bit uncompressed). Stereo is great, but if you have wonderful music one might argue that 44k mono is a better choice at the same datarate. Always normalize your audio files (`maximize' in DigiDesign parlance). Conversion to 22k is a much- discussed art; make sure it sounds good to you before you try to compress it. Remember, with video, audio, and everything else, "