Q: I can't find where to place the key code. I can't see any Register button. Can you help me?
Q: What is the easiest way to upgrade?
A: Simply download and install the new version in your computer, without uninstalling the previous version. DePopper cannot be running during the upgrade (Windows does not allow replacing files in use).
Q: How do I see my version number?
Q: What are the differences between DePopper 2 and DePopper 3?
Q: Will DePopper installation write harmful files to my system directory? Do I have to reboot after installing DePopper? Does DePopper have spywares?
A: No, no and no. DePopper does not write harmful files anywhere in your computer, does not have spywares and is not adware. DePopper setup does not require a reboot.
Q: Does DePopper main screen accept Drag & Drop?
A: Yes. This the easiest way of adding files to the file list, in our opinion. All source files must be in the same folder.
Q: My cat played with my records and now they are full of scratches. Does DePopper remove ALL clicks and pops from my records?
Q: DePopper works great with my friend's records, but has poor results with the records I have stacked in my basement during 40 years, with rats, bats and ants. This is not fair! Shouldn't DePopper give the same results for ALL RECORDS EVERYWHERE?
A: Definitely NO! DePopper results depend on the source material.
Q: Which format should I use for recording? What do you have against mp3 and wma?
Q: Why is Play disabled when I click the Preview button, in Options screen?
Q: I am getting "access denied" messages when I process some files in DePopper. Is there a fix?
A: Yes, download and setup the newest version of DePopper and this problem will disappear.
Q: I haven't used DePopper for some time and now it is requesting the key code again. Why? Should't DePopper keep the key code forever?
Q: I use Windows XP/2000/Vista/Win7 and my computer freezes, shuts down or reboots when I am processing my files with DePopper. What happens?
Q: When I use the Minimize Hiss filter in the default setting I notice that the hiss disappears during quiet passages, but appears during louder volume passages, to disappear again when low volume or silent passages happen again. Is there a way to eliminate the hiss completely?
Q: I have DePopper 2. I used DePopper normally in the past, but then I did not use it for some months (or years). Now, when I attempt to use DePopper, Windows displays an error message. Why this started to happen now, if DePopper worked well some months (or years) ago and I did not make changes in DePopper?
A: Of course DePopper can do nothing if you are not using it. DePopper has no "quick start" modules or something like that. If DePopper is not in use, nothing in DePopper is working at all. If you did not use DePopper during months, DePopper remained there, completely inactive. But exactly because it was inactive, DePopper was vulnerable to to other ill-behaved programs. For example, some other programs can have erased DePopper permanent data in Windows Registry, or replaced some system files (that Windows use when DePopper needs to execute specific functions, like file parsing), or even damaged DePopper program files. The last option would happen only if your computer was invaded by virus or trojans/rootkits. But the two first options are likely to happen, particularly the replacement or deletion of system files. The replacement of a system file can happen when a new program is installed and its setup has some bug. The deletion of system files is usually done by the user, believing in hoax emails saying that some system file is dangerous and asking to delete it urgently. How to fix: sometimes reinstalling DePopper fixes the problem. If not, an upgrade to a newer DePopper version is necessary, particularly if using Windows XP with Service Pack 3.
Q: Is there a limit for the size of the files that DePopper can process?
A: Yes. The temporary and output files should not exceed 2 gigabytes. For 16 bits wav output, this means that the duration of each file (time length) should not exceed 180 minutes (3 hours). For 32 bits wav output the maximum time length for a single file will be 90 minutes. For 64 bits float wav output the maximum time length for a single file will be 45 minutes.
Q: Why DePopper does not accept some mp3 files? Is there something I can do?
Q: Is there a way to use DePopper with m4a (iPod) files? Can DePopper encode m4a?
Q: Is there a way to use DePopper with flac files? Can DePopper encode flac?
Q: I want to record some songs from a cassette player to my computer, but the sound from the player almost does not have trebles, only tape/player hiss. I want the best possible sound, so what can I do?
Q: How can I process many files in sequence? When I try to add new files to the list, the old files disappear.
Q: In the past I recorded a CD from an LP. It is an audio CD, not a data CD and has all the noises and scratches of the original recording. Is there a way I can clean it up with DePopper?
A: Yes, use other program (there are many) to extract the songs from the CD as WAV files. Then clean them up with DePopper. Extract the files as WAV, not MP3 or WMA, because lossy compressed formats, like MP3 and MPA, decrease the audio quality. Later, if you want, you can convert your processed songs to one of these formats.
Q: What is the purpose of the file named undrnstl.exe that DePopper version 2 writes in the Windows folder? And why this file is not removed when I uninstall DePopper?
A: The file undrnstl.exe is the uninstaller for the now very old versions 1 and 2 of DePopper. The use of this file was deprecated in version 3, released in the beginning of 2009. Uninstalling DePopper does not remove this file because Windows does not allow a file to delete itself, but you can manually delete it anytime you want. Installing version 3 or newer does not create this file anymore.
Q: I have a program that opens wav files written with DePopper 2 but does not open files written with DePopper 3 or newer. What can I do?
A: Upgrade to DePopper 4 or newer, go to Advanced Options, click on WAV (sub-item of Output) on the left and in change the output header format to DePopper 2.
Q: Batch Transformer does not open files written with DePopper 2 in my computer, but opens files recorded with Wave Editor. Why?
Q: After processing, Depopper says "N% samples exceeded max level in Volume Normalization". What does this mean? Should I be concerned about it? Playback seems to be ok.
Q: I have some audio files that have very, very low level. When I normalize them with DePopper, they sound worse. Why?
A: When the recorded audio level is very low, DePopper normalization amplifies everything in the audio file, including noise and artifacts. If the noise and artifacts were not audible before, they will become audible after normalization. The most effective solution for this problem is to set a higher level when recording. DePopper normalization filters are very useful for adjusting files that have normal average levels. Files with extremely low levels frequently have inherent noise, artifacts and (if the level is too low) distortion. If you amplify something bad, you will get something worse.
Q: I use DePopper 3 or older. After I process a big number of files at once, I see a screen stating "Final report - success" with a list of processed songs. Windows tells me I cannot close this screen because it is waiting for a response for me, but the button is not visible. What can I do?
A: When the Ok button is not visible in the final report because of the number of songs, press ENTER and the final report screen will close.
Q: DePopper worked fine until some weeks ago, but now when I try to process my audio files I see a message like this: "Could not open file myfile_tmp.wav". What happens?
Q: I love PDF format. Does DePopper have PDF documentation?
A: Yes. In Windows taskbar, click the All Programs button, then the DAK shortcut, then DePopper Version 3 and finally "User Guide (pdf)". The PDF documentation will open, with hyperlinks and bookmarks list.
Q: Can you explain in detail how Popper minimizes the hiss from a tape?
