You’re in luck these days, but you still need to avoid 95% of the digital aids out there and try to find a competent audiologist that really knows what the heck she/he is doing and/or acquire your own NOAHlink/HI Pro and do the adjustments yourself. That being said, based on what I’ve read and user feedback, these brands and models may currently be suitable for the most natural sound reproduction:
Sonic with the Variable Speech Processing
Widex with the Dream circuitry
Resound with the Surround Sound
Unitron with the North Platform
Phonak with the Venture Platform
Bernafon 7/9 with the Live Music Plus
“Suitable” within this context means accurate reproduction of what an analog aid does without distortion or artifacting from either hardware limitations or software flaws and which would be a byproduct of reproducing music accurately. You may not like the multiple channel, wide dynamic range compression (WDRC) which is the default compression scheme used on digital aids, what with having trained your auditory cortex on single channel, linear compression. WDRC amplifies softer sounds and dampens louder sounds which is the exact opposite of the experience you described, so I think you just had a misconfigured and/or inappropriate aid (Siemens hasn’t been known for doing much right historically anymore than Starkey or Resound has). Some digital aids have a linear amplification scheme you can switch to to emulate what analog did, but this is not a broadband single channel so there is still some fidelity loss from recombining and summing the individual channels back together (it goes without saying that if the audio input and/or processing hardware is crippled garbage, no amount of downstream or software tweaking can ever possibly fix it… here’s looking at you, Resound Sparx!).
You also have the option to just continue to buy your existing aid refurbished or a better model such as the Phonak NovoForte from Prairie Labs who refurbishes and sells analog aids. However, I think the additional enhancement features digitals offer in this new generation of sound reproduction deems them worthy of trying out as a first choice. My bias is to Sonic because they built their digital reputation solely on a natural sound quality unlike all the other manufacturers. Do not be swayed by the cronyism and biases of audiologists and/or hearing aids fitters – THEY ARE NOT THE ONE WEARING THE AID!